CVE-2024-49949 (GCVE-0-2024-49949)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-05-12 11:59
VLAI?
Title
net: avoid potential underflow in qdisc_pkt_len_init() with UFO
Summary
In the Linux kernel, the following vulnerability has been resolved: net: avoid potential underflow in qdisc_pkt_len_init() with UFO After commit 7c6d2ecbda83 ("net: be more gentle about silly gso requests coming from user") virtio_net_hdr_to_skb() had sanity check to detect malicious attempts from user space to cook a bad GSO packet. Then commit cf9acc90c80ec ("net: virtio_net_hdr_to_skb: count transport header in UFO") while fixing one issue, allowed user space to cook a GSO packet with the following characteristic : IPv4 SKB_GSO_UDP, gso_size=3, skb->len = 28. When this packet arrives in qdisc_pkt_len_init(), we end up with hdr_len = 28 (IPv4 header + UDP header), matching skb->len Then the following sets gso_segs to 0 : gso_segs = DIV_ROUND_UP(skb->len - hdr_len, shinfo->gso_size); Then later we set qdisc_skb_cb(skb)->pkt_len to back to zero :/ qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; This leads to the following crash in fq_codel [1] qdisc_pkt_len_init() is best effort, we only want an estimation of the bytes sent on the wire, not crashing the kernel. This patch is fixing this particular issue, a following one adds more sanity checks for another potential bug. [1] [ 70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 70.724561] #PF: supervisor read access in kernel mode [ 70.724561] #PF: error_code(0x0000) - not-present page [ 70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0 [ 70.724561] Oops: Oops: 0000 [#1] SMP NOPTI [ 70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991 [ 70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel [ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 <49> 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49 All code ======== 0: 24 08 and $0x8,%al 2: 49 c1 e1 06 shl $0x6,%r9 6: 44 89 7c 24 18 mov %r15d,0x18(%rsp) b: 45 31 ed xor %r13d,%r13d e: 45 31 c0 xor %r8d,%r8d 11: 31 ff xor %edi,%edi 13: 89 44 24 14 mov %eax,0x14(%rsp) 17: 4c 03 8b 90 01 00 00 add 0x190(%rbx),%r9 1e: eb 04 jmp 0x24 20: 39 ca cmp %ecx,%edx 22: 73 37 jae 0x5b 24: 4d 8b 39 mov (%r9),%r15 27: 83 c7 01 add $0x1,%edi 2a:* 49 8b 17 mov (%r15),%rdx <-- trapping instruction 2d: 49 89 11 mov %rdx,(%r9) 30: 41 8b 57 28 mov 0x28(%r15),%edx 34: 45 8b 5f 34 mov 0x34(%r15),%r11d 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB Code starting with the faulting instruction =========================================== 0: 49 8b 17 mov (%r15),%rdx 3: 49 89 11 mov %rdx,(%r9) 6: 41 8b 57 28 mov 0x28(%r15),%edx a: 45 8b 5f 34 mov 0x34(%r15),%r11d e: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 15: 49 rex.WB [ 70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202 [ 70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000 [ 70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 [ 70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000 [ 70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58 [ 70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000 [ 70.724561] FS: 000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000 [ 70.724561] CS: 0010 DS: 0000 ES: 0000 C ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 960b360ca7463921c1a6b72e7066a706d6406223 , < d70ca7598943572d5e384227bd268acb5109bf72 (git)
Affected: fb2dbc124a7f800cd0e4f901a1bbb769a017104c , < 1598d70ad9c7d0a4d9d54b82094e9f45908fda6d (git)
Affected: 8e6bae950da9dc2d2c6c18b1c6b206dc00dc8772 , < ba26060a29d3ca1bfc737aa79f7125128f35147c (git)
Affected: 0f810d06b507aa40fef8d1ac0a88e6d0590dbfc3 , < 939c88cbdc668dadd8cfa7a35d9066331239041c (git)
Affected: cf9acc90c80ecbee00334aa85d92f4e74014bcff , < d6114993e0a89fde84a60a60a8329a571580b174 (git)
Affected: cf9acc90c80ecbee00334aa85d92f4e74014bcff , < 25ab0b87dbd89cecef8a9c60a02bb97832e471d1 (git)
Affected: cf9acc90c80ecbee00334aa85d92f4e74014bcff , < f959cce8a2a04ce776aa8b78e83ce339e0d7fbac (git)
Affected: cf9acc90c80ecbee00334aa85d92f4e74014bcff , < 81fd007dcd47c34471766249853e4d4bce8eea4b (git)
Affected: cf9acc90c80ecbee00334aa85d92f4e74014bcff , < c20029db28399ecc50e556964eaba75c43b1e2f1 (git)
Affected: 2128303bff700c857739a0af8cc39c1a41840650 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 4.19.323 , ≤ 4.19.* (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: avoid potential underflow in qdisc_pkt_len_init() with UFO\n\nAfter commit 7c6d2ecbda83 (\"net: be more gentle about silly gso\nrequests coming from user\") virtio_net_hdr_to_skb() had sanity check\nto detect malicious attempts from user space to cook a bad GSO packet.\n\nThen commit cf9acc90c80ec (\"net: virtio_net_hdr_to_skb: count\ntransport header in UFO\") while fixing one issue, allowed user space\nto cook a GSO packet with the following characteristic :\n\nIPv4 SKB_GSO_UDP, gso_size=3, skb-\u003elen = 28.\n\nWhen this packet arrives in qdisc_pkt_len_init(), we end up\nwith hdr_len = 28 (IPv4 header + UDP header), matching skb-\u003elen\n\nThen the following sets gso_segs to 0 :\n\ngso_segs = DIV_ROUND_UP(skb-\u003elen - hdr_len,\n                        shinfo-\u003egso_size);\n\nThen later we set qdisc_skb_cb(skb)-\u003epkt_len to back to zero :/\n\nqdisc_skb_cb(skb)-\u003epkt_len += (gso_segs - 1) * hdr_len;\n\nThis leads to the following crash in fq_codel [1]\n\nqdisc_pkt_len_init() is best effort, we only want an estimation\nof the bytes sent on the wire, not crashing the kernel.\n\nThis patch is fixing this particular issue, a following one\nadds more sanity checks for another potential bug.\n\n[1]\n[   70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[   70.724561] #PF: supervisor read access in kernel mode\n[   70.724561] #PF: error_code(0x0000) - not-present page\n[   70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0\n[   70.724561] Oops: Oops: 0000 [#1] SMP NOPTI\n[   70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991\n[   70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel\n[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u003c49\u003e 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49\nAll code\n========\n   0:\t24 08                \tand    $0x8,%al\n   2:\t49 c1 e1 06          \tshl    $0x6,%r9\n   6:\t44 89 7c 24 18       \tmov    %r15d,0x18(%rsp)\n   b:\t45 31 ed             \txor    %r13d,%r13d\n   e:\t45 31 c0             \txor    %r8d,%r8d\n  11:\t31 ff                \txor    %edi,%edi\n  13:\t89 44 24 14          \tmov    %eax,0x14(%rsp)\n  17:\t4c 03 8b 90 01 00 00 \tadd    0x190(%rbx),%r9\n  1e:\teb 04                \tjmp    0x24\n  20:\t39 ca                \tcmp    %ecx,%edx\n  22:\t73 37                \tjae    0x5b\n  24:\t4d 8b 39             \tmov    (%r9),%r15\n  27:\t83 c7 01             \tadd    $0x1,%edi\n  2a:*\t49 8b 17             \tmov    (%r15),%rdx\t\t\u003c-- trapping instruction\n  2d:\t49 89 11             \tmov    %rdx,(%r9)\n  30:\t41 8b 57 28          \tmov    0x28(%r15),%edx\n  34:\t45 8b 5f 34          \tmov    0x34(%r15),%r11d\n  38:\t49 c7 07 00 00 00 00 \tmovq   $0x0,(%r15)\n  3f:\t49                   \trex.WB\n\nCode starting with the faulting instruction\n===========================================\n   0:\t49 8b 17             \tmov    (%r15),%rdx\n   3:\t49 89 11             \tmov    %rdx,(%r9)\n   6:\t41 8b 57 28          \tmov    0x28(%r15),%edx\n   a:\t45 8b 5f 34          \tmov    0x34(%r15),%r11d\n   e:\t49 c7 07 00 00 00 00 \tmovq   $0x0,(%r15)\n  15:\t49                   \trex.WB\n[   70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202\n[   70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000\n[   70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\n[   70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000\n[   70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58\n[   70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000\n[   70.724561] FS:  000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000\n[   70.724561] CS:  0010 DS: 0000 ES: 0000 C\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:42:39.548Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72"
        },
        {
          "url": "https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c"
        },
        {
          "url": "https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174"
        },
        {
          "url": "https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac"
        },
        {
          "url": "https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1"
        }
      ],
      "title": "net: avoid potential underflow in qdisc_pkt_len_init() with UFO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49949",
    "datePublished": "2024-10-21T18:02:05.756Z",
    "dateReserved": "2024-10-21T12:17:06.046Z",
    "dateUpdated": "2026-05-12T11:59:19.790Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-49949",
      "date": "2026-05-20",
      "epss": "0.00011",
      "percentile": "0.01363"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.14.256\", \"versionEndExcluding\": \"4.19\", \"matchCriteriaId\": \"A65B3644-91EE-4B1C-A5CF-253819BE1EC3\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.19.218\", \"versionEndExcluding\": \"5.4\", \"matchCriteriaId\": \"2D3CD36D-4780-44E2-A521-551C7B8061CF\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.4.162\", \"versionEndExcluding\": \"5.10\", \"matchCriteriaId\": \"9C7E9A0A-E6D9-4E60-AD73-9CF1D0F9B6AB\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.10.82\", \"versionEndExcluding\": \"5.10.227\", \"matchCriteriaId\": \"C58B614C-6238-4CEF-925B-C21E34EAF649\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.15.5\", \"versionEndExcluding\": \"5.15.168\", \"matchCriteriaId\": \"E10FCFE9-1824-43FF-B470-A6E50DAF31F7\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.16\", \"versionEndExcluding\": \"6.1.113\", \"matchCriteriaId\": \"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.2\", \"versionEndExcluding\": \"6.6.55\", \"matchCriteriaId\": \"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.7\", \"versionEndExcluding\": \"6.10.14\", \"matchCriteriaId\": \"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.11\", \"versionEndExcluding\": \"6.11.3\", \"matchCriteriaId\": \"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"7F361E1D-580F-4A2D-A509-7615F73167A1\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: avoid potential underflow in qdisc_pkt_len_init() with UFO\\n\\nAfter commit 7c6d2ecbda83 (\\\"net: be more gentle about silly gso\\nrequests coming from user\\\") virtio_net_hdr_to_skb() had sanity check\\nto detect malicious attempts from user space to cook a bad GSO packet.\\n\\nThen commit cf9acc90c80ec (\\\"net: virtio_net_hdr_to_skb: count\\ntransport header in UFO\\\") while fixing one issue, allowed user space\\nto cook a GSO packet with the following characteristic :\\n\\nIPv4 SKB_GSO_UDP, gso_size=3, skb-\u003elen = 28.\\n\\nWhen this packet arrives in qdisc_pkt_len_init(), we end up\\nwith hdr_len = 28 (IPv4 header + UDP header), matching skb-\u003elen\\n\\nThen the following sets gso_segs to 0 :\\n\\ngso_segs = DIV_ROUND_UP(skb-\u003elen - hdr_len,\\n                        shinfo-\u003egso_size);\\n\\nThen later we set qdisc_skb_cb(skb)-\u003epkt_len to back to zero :/\\n\\nqdisc_skb_cb(skb)-\u003epkt_len += (gso_segs - 1) * hdr_len;\\n\\nThis leads to the following crash in fq_codel [1]\\n\\nqdisc_pkt_len_init() is best effort, we only want an estimation\\nof the bytes sent on the wire, not crashing the kernel.\\n\\nThis patch is fixing this particular issue, a following one\\nadds more sanity checks for another potential bug.\\n\\n[1]\\n[   70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[   70.724561] #PF: supervisor read access in kernel mode\\n[   70.724561] #PF: error_code(0x0000) - not-present page\\n[   70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0\\n[   70.724561] Oops: Oops: 0000 [#1] SMP NOPTI\\n[   70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991\\n[   70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel\\n[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u003c49\u003e 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49\\nAll code\\n========\\n   0:\\t24 08                \\tand    $0x8,%al\\n   2:\\t49 c1 e1 06          \\tshl    $0x6,%r9\\n   6:\\t44 89 7c 24 18       \\tmov    %r15d,0x18(%rsp)\\n   b:\\t45 31 ed             \\txor    %r13d,%r13d\\n   e:\\t45 31 c0             \\txor    %r8d,%r8d\\n  11:\\t31 ff                \\txor    %edi,%edi\\n  13:\\t89 44 24 14          \\tmov    %eax,0x14(%rsp)\\n  17:\\t4c 03 8b 90 01 00 00 \\tadd    0x190(%rbx),%r9\\n  1e:\\teb 04                \\tjmp    0x24\\n  20:\\t39 ca                \\tcmp    %ecx,%edx\\n  22:\\t73 37                \\tjae    0x5b\\n  24:\\t4d 8b 39             \\tmov    (%r9),%r15\\n  27:\\t83 c7 01             \\tadd    $0x1,%edi\\n  2a:*\\t49 8b 17             \\tmov    (%r15),%rdx\\t\\t\u003c-- trapping instruction\\n  2d:\\t49 89 11             \\tmov    %rdx,(%r9)\\n  30:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n  34:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n  38:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  3f:\\t49                   \\trex.WB\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t49 8b 17             \\tmov    (%r15),%rdx\\n   3:\\t49 89 11             \\tmov    %rdx,(%r9)\\n   6:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n   a:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n   e:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  15:\\t49                   \\trex.WB\\n[   70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202\\n[   70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000\\n[   70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\\n[   70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000\\n[   70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58\\n[   70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000\\n[   70.724561] FS:  000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000\\n[   70.724561] CS:  0010 DS: 0000 ES: 0000 C\\n---truncated---\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: evitar un posible desbordamiento en qdisc_pkt_len_init() con UFO Despu\\u00e9s de el commit 7c6d2ecbda83 (\\\"net: sea m\\u00e1s cuidadoso con las solicitudes gso tontas que vienen del usuario\\\"), virtio_net_hdr_to_skb() tuvo una verificaci\\u00f3n de cordura para detectar intentos maliciosos desde el espacio del usuario de cocinar un paquete GSO defectuoso. Luego, confirma cf9acc90c80ec (\\\"net: virtio_net_hdr_to_skb: cuenta el encabezado de transporte en UFO\\\") mientras corrige un problema, permiti\\u00f3 que el espacio de usuario cocinara un paquete GSO con la siguiente caracter\\u00edstica: IPv4 SKB_GSO_UDP, gso_size=3, skb-\u0026gt;len = 28. Cuando este paquete llega a qdisc_pkt_len_init(), terminamos con hdr_len = 28 (encabezado IPv4 + encabezado UDP), que coincide con skb-\u0026gt;len. Luego, lo siguiente establece gso_segs en 0: gso_segs = DIV_ROUND_UP(skb-\u0026gt;len - hdr_len, shinfo-\u0026gt;gso_size); Luego, configuramos qdisc_skb_cb(skb)-\u0026gt;pkt_len nuevamente a cero :/ qdisc_skb_cb(skb)-\u0026gt;pkt_len += (gso_segs - 1) * hdr_len; Esto genera el siguiente bloqueo en fq_codel [1] qdisc_pkt_len_init() es el mejor esfuerzo, solo queremos una estimaci\\u00f3n de los bytes enviados en la red, no bloquear el kernel. Este parche soluciona este problema en particular, el siguiente agrega m\\u00e1s controles de cordura para otro error potencial. [1] [ 70.724101] ERROR: desreferencia de puntero NULL del n\\u00facleo, direcci\\u00f3n: 0000000000000000 [ 70.724561] #PF: acceso de lectura del supervisor en modo n\\u00facleo [ 70.724561] #PF: error_code(0x0000) - p\\u00e1gina no presente [ 70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0 [ 70.724561] Oops: Oops: 0000 [#1] SMP NOPTI [ 70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 No contaminado 6.11.0-virtme #991 [ 70.724561] Nombre del hardware: PC est\\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 01/04/2014 [ 70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel [ 70.724561] C\\u00f3digo: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u0026lt;49\u0026gt; 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49 Todo el c\\u00f3digo ======== 0: 24 08 y $0x8,%al 2: 49 c1 e1 06 shl $0x6,%r9 6: 44 89 7c 24 18 mov %r15d,0x18(%rsp) b: 45 31 ed xor %r13d,%r13d e: 45 31 c0 xor %r8d,%r8d 11: 31 ff xor %edi,%edi 13: 89 44 24 14 mov %eax,0x14(%rsp) 17: 4c 03 8b 90 01 00 00 suma 0x190(%rbx),%r9 1e: eb 04 jmp 0x24 20: 39 ca cmp %ecx,%edx 22: 73 37 jae 0x5b 24: 4d 8b 39 mov (%r9),%r15 27: 83 c7 01 suma $0x1,%edi 2a:* 49 8b 17 mov (%r15),%rdx \u0026lt;-- instrucci\\u00f3n de captura 2d: 49 89 11 mov %rdx,(%r9) 30: 41 8b 57 28 mov 0x28(%r15),%edx 34: 45 8b 5f 34 mov 0x34(%r15),%r11d 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB C\\u00f3digo que comienza con la instrucci\\u00f3n que fallo ============================================= 0: 49 8b 17 mov (%r15),%rdx 3: 49 89 11 mov %rdx,(%r9) 6: 41 8b 57 28 mov 0x28(%r15),%edx a: 45 8b 5f 34 mov 0x34(%r15),%r11d e: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 15: 49 rex.WB [ 70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202 [ 70.724561] RAX: 000000000200000 RBX: ffff95ae841de000 RCX: 0000000000000000 [ 70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000000000001 [ 70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000 [ 70.724561] R10: 000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58 [ 70.724561] R13: 000000000000000 R14: 0000000000000040 R15: 0000000000000000 [ 70.724561] FS: 000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000 [ 70.724561] CS: 0010 DS: 0000 ES: 0000 C ---truncado---\"}]",
      "id": "CVE-2024-49949",
      "lastModified": "2024-11-12T21:03:59.377",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 3.6}]}",
      "published": "2024-10-21T18:15:16.323",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-476\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49949\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:16.323\",\"lastModified\":\"2026-05-12T12:17:18.633\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: avoid potential underflow in qdisc_pkt_len_init() with UFO\\n\\nAfter commit 7c6d2ecbda83 (\\\"net: be more gentle about silly gso\\nrequests coming from user\\\") virtio_net_hdr_to_skb() had sanity check\\nto detect malicious attempts from user space to cook a bad GSO packet.\\n\\nThen commit cf9acc90c80ec (\\\"net: virtio_net_hdr_to_skb: count\\ntransport header in UFO\\\") while fixing one issue, allowed user space\\nto cook a GSO packet with the following characteristic :\\n\\nIPv4 SKB_GSO_UDP, gso_size=3, skb-\u003elen = 28.\\n\\nWhen this packet arrives in qdisc_pkt_len_init(), we end up\\nwith hdr_len = 28 (IPv4 header + UDP header), matching skb-\u003elen\\n\\nThen the following sets gso_segs to 0 :\\n\\ngso_segs = DIV_ROUND_UP(skb-\u003elen - hdr_len,\\n                        shinfo-\u003egso_size);\\n\\nThen later we set qdisc_skb_cb(skb)-\u003epkt_len to back to zero :/\\n\\nqdisc_skb_cb(skb)-\u003epkt_len += (gso_segs - 1) * hdr_len;\\n\\nThis leads to the following crash in fq_codel [1]\\n\\nqdisc_pkt_len_init() is best effort, we only want an estimation\\nof the bytes sent on the wire, not crashing the kernel.\\n\\nThis patch is fixing this particular issue, a following one\\nadds more sanity checks for another potential bug.\\n\\n[1]\\n[   70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[   70.724561] #PF: supervisor read access in kernel mode\\n[   70.724561] #PF: error_code(0x0000) - not-present page\\n[   70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0\\n[   70.724561] Oops: Oops: 0000 [#1] SMP NOPTI\\n[   70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991\\n[   70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel\\n[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u003c49\u003e 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49\\nAll code\\n========\\n   0:\\t24 08                \\tand    $0x8,%al\\n   2:\\t49 c1 e1 06          \\tshl    $0x6,%r9\\n   6:\\t44 89 7c 24 18       \\tmov    %r15d,0x18(%rsp)\\n   b:\\t45 31 ed             \\txor    %r13d,%r13d\\n   e:\\t45 31 c0             \\txor    %r8d,%r8d\\n  11:\\t31 ff                \\txor    %edi,%edi\\n  13:\\t89 44 24 14          \\tmov    %eax,0x14(%rsp)\\n  17:\\t4c 03 8b 90 01 00 00 \\tadd    0x190(%rbx),%r9\\n  1e:\\teb 04                \\tjmp    0x24\\n  20:\\t39 ca                \\tcmp    %ecx,%edx\\n  22:\\t73 37                \\tjae    0x5b\\n  24:\\t4d 8b 39             \\tmov    (%r9),%r15\\n  27:\\t83 c7 01             \\tadd    $0x1,%edi\\n  2a:*\\t49 8b 17             \\tmov    (%r15),%rdx\\t\\t\u003c-- trapping instruction\\n  2d:\\t49 89 11             \\tmov    %rdx,(%r9)\\n  30:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n  34:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n  38:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  3f:\\t49                   \\trex.WB\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t49 8b 17             \\tmov    (%r15),%rdx\\n   3:\\t49 89 11             \\tmov    %rdx,(%r9)\\n   6:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n   a:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n   e:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  15:\\t49                   \\trex.WB\\n[   70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202\\n[   70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000\\n[   70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\\n[   70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000\\n[   70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58\\n[   70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000\\n[   70.724561] FS:  000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000\\n[   70.724561] CS:  0010 DS: 0000 ES: 0000 C\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: evitar un posible desbordamiento en qdisc_pkt_len_init() con UFO Despu\u00e9s de el commit 7c6d2ecbda83 (\\\"net: sea m\u00e1s cuidadoso con las solicitudes gso tontas que vienen del usuario\\\"), virtio_net_hdr_to_skb() tuvo una verificaci\u00f3n de cordura para detectar intentos maliciosos desde el espacio del usuario de cocinar un paquete GSO defectuoso. Luego, confirma cf9acc90c80ec (\\\"net: virtio_net_hdr_to_skb: cuenta el encabezado de transporte en UFO\\\") mientras corrige un problema, permiti\u00f3 que el espacio de usuario cocinara un paquete GSO con la siguiente caracter\u00edstica: IPv4 SKB_GSO_UDP, gso_size=3, skb-\u0026gt;len = 28. Cuando este paquete llega a qdisc_pkt_len_init(), terminamos con hdr_len = 28 (encabezado IPv4 + encabezado UDP), que coincide con skb-\u0026gt;len. Luego, lo siguiente establece gso_segs en 0: gso_segs = DIV_ROUND_UP(skb-\u0026gt;len - hdr_len, shinfo-\u0026gt;gso_size); Luego, configuramos qdisc_skb_cb(skb)-\u0026gt;pkt_len nuevamente a cero :/ qdisc_skb_cb(skb)-\u0026gt;pkt_len += (gso_segs - 1) * hdr_len; Esto genera el siguiente bloqueo en fq_codel [1] qdisc_pkt_len_init() es el mejor esfuerzo, solo queremos una estimaci\u00f3n de los bytes enviados en la red, no bloquear el kernel. Este parche soluciona este problema en particular, el siguiente agrega m\u00e1s controles de cordura para otro error potencial. [1] [ 70.724101] ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000000 [ 70.724561] #PF: acceso de lectura del supervisor en modo n\u00facleo [ 70.724561] #PF: error_code(0x0000) - p\u00e1gina no presente [ 70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0 [ 70.724561] Oops: Oops: 0000 [#1] SMP NOPTI [ 70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 No contaminado 6.11.0-virtme #991 [ 70.724561] Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 01/04/2014 [ 70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel [ 70.724561] C\u00f3digo: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u0026lt;49\u0026gt; 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49 Todo el c\u00f3digo ======== 0: 24 08 y $0x8,%al 2: 49 c1 e1 06 shl $0x6,%r9 6: 44 89 7c 24 18 mov %r15d,0x18(%rsp) b: 45 31 ed xor %r13d,%r13d e: 45 31 c0 xor %r8d,%r8d 11: 31 ff xor %edi,%edi 13: 89 44 24 14 mov %eax,0x14(%rsp) 17: 4c 03 8b 90 01 00 00 suma 0x190(%rbx),%r9 1e: eb 04 jmp 0x24 20: 39 ca cmp %ecx,%edx 22: 73 37 jae 0x5b 24: 4d 8b 39 mov (%r9),%r15 27: 83 c7 01 suma $0x1,%edi 2a:* 49 8b 17 mov (%r15),%rdx \u0026lt;-- instrucci\u00f3n de captura 2d: 49 89 11 mov %rdx,(%r9) 30: 41 8b 57 28 mov 0x28(%r15),%edx 34: 45 8b 5f 34 mov 0x34(%r15),%r11d 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB C\u00f3digo que comienza con la instrucci\u00f3n que fallo ============================================= 0: 49 8b 17 mov (%r15),%rdx 3: 49 89 11 mov %rdx,(%r9) 6: 41 8b 57 28 mov 0x28(%r15),%edx a: 45 8b 5f 34 mov 0x34(%r15),%r11d e: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 15: 49 rex.WB [ 70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202 [ 70.724561] RAX: 000000000200000 RBX: ffff95ae841de000 RCX: 0000000000000000 [ 70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000000000001 [ 70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000 [ 70.724561] R10: 000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58 [ 70.724561] R13: 000000000000000 R14: 0000000000000040 R15: 0000000000000000 [ 70.724561] FS: 000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000 [ 70.724561] CS: 0010 DS: 0000 ES: 0000 C ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.256\",\"versionEndExcluding\":\"4.19\",\"matchCriteriaId\":\"A65B3644-91EE-4B1C-A5CF-253819BE1EC3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.218\",\"versionEndExcluding\":\"5.4\",\"matchCriteriaId\":\"2D3CD36D-4780-44E2-A521-551C7B8061CF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.162\",\"versionEndExcluding\":\"5.10\",\"matchCriteriaId\":\"9C7E9A0A-E6D9-4E60-AD73-9CF1D0F9B6AB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.82\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"C58B614C-6238-4CEF-925B-C21E34EAF649\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.5\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"E10FCFE9-1824-43FF-B470-A6E50DAF31F7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-398330.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:23:29.408Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49949\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:36:39.259120Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:36:43.167Z\"}}], \"cna\": {\"title\": \"net: avoid potential underflow in qdisc_pkt_len_init() with UFO\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"960b360ca7463921c1a6b72e7066a706d6406223\", \"lessThan\": \"d70ca7598943572d5e384227bd268acb5109bf72\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb2dbc124a7f800cd0e4f901a1bbb769a017104c\", \"lessThan\": \"1598d70ad9c7d0a4d9d54b82094e9f45908fda6d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8e6bae950da9dc2d2c6c18b1c6b206dc00dc8772\", \"lessThan\": \"ba26060a29d3ca1bfc737aa79f7125128f35147c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0f810d06b507aa40fef8d1ac0a88e6d0590dbfc3\", \"lessThan\": \"939c88cbdc668dadd8cfa7a35d9066331239041c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cf9acc90c80ecbee00334aa85d92f4e74014bcff\", \"lessThan\": \"d6114993e0a89fde84a60a60a8329a571580b174\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cf9acc90c80ecbee00334aa85d92f4e74014bcff\", \"lessThan\": \"25ab0b87dbd89cecef8a9c60a02bb97832e471d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cf9acc90c80ecbee00334aa85d92f4e74014bcff\", \"lessThan\": \"f959cce8a2a04ce776aa8b78e83ce339e0d7fbac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cf9acc90c80ecbee00334aa85d92f4e74014bcff\", \"lessThan\": \"81fd007dcd47c34471766249853e4d4bce8eea4b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cf9acc90c80ecbee00334aa85d92f4e74014bcff\", \"lessThan\": \"c20029db28399ecc50e556964eaba75c43b1e2f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2128303bff700c857739a0af8cc39c1a41840650\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/dev.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/dev.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72\"}, {\"url\": \"https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d\"}, {\"url\": \"https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c\"}, {\"url\": \"https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c\"}, {\"url\": \"https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174\"}, {\"url\": \"https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1\"}, {\"url\": \"https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac\"}, {\"url\": \"https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b\"}, {\"url\": \"https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: avoid potential underflow in qdisc_pkt_len_init() with UFO\\n\\nAfter commit 7c6d2ecbda83 (\\\"net: be more gentle about silly gso\\nrequests coming from user\\\") virtio_net_hdr_to_skb() had sanity check\\nto detect malicious attempts from user space to cook a bad GSO packet.\\n\\nThen commit cf9acc90c80ec (\\\"net: virtio_net_hdr_to_skb: count\\ntransport header in UFO\\\") while fixing one issue, allowed user space\\nto cook a GSO packet with the following characteristic :\\n\\nIPv4 SKB_GSO_UDP, gso_size=3, skb-\u003elen = 28.\\n\\nWhen this packet arrives in qdisc_pkt_len_init(), we end up\\nwith hdr_len = 28 (IPv4 header + UDP header), matching skb-\u003elen\\n\\nThen the following sets gso_segs to 0 :\\n\\ngso_segs = DIV_ROUND_UP(skb-\u003elen - hdr_len,\\n                        shinfo-\u003egso_size);\\n\\nThen later we set qdisc_skb_cb(skb)-\u003epkt_len to back to zero :/\\n\\nqdisc_skb_cb(skb)-\u003epkt_len += (gso_segs - 1) * hdr_len;\\n\\nThis leads to the following crash in fq_codel [1]\\n\\nqdisc_pkt_len_init() is best effort, we only want an estimation\\nof the bytes sent on the wire, not crashing the kernel.\\n\\nThis patch is fixing this particular issue, a following one\\nadds more sanity checks for another potential bug.\\n\\n[1]\\n[   70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[   70.724561] #PF: supervisor read access in kernel mode\\n[   70.724561] #PF: error_code(0x0000) - not-present page\\n[   70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0\\n[   70.724561] Oops: Oops: 0000 [#1] SMP NOPTI\\n[   70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991\\n[   70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel\\n[ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 \u003c49\u003e 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49\\nAll code\\n========\\n   0:\\t24 08                \\tand    $0x8,%al\\n   2:\\t49 c1 e1 06          \\tshl    $0x6,%r9\\n   6:\\t44 89 7c 24 18       \\tmov    %r15d,0x18(%rsp)\\n   b:\\t45 31 ed             \\txor    %r13d,%r13d\\n   e:\\t45 31 c0             \\txor    %r8d,%r8d\\n  11:\\t31 ff                \\txor    %edi,%edi\\n  13:\\t89 44 24 14          \\tmov    %eax,0x14(%rsp)\\n  17:\\t4c 03 8b 90 01 00 00 \\tadd    0x190(%rbx),%r9\\n  1e:\\teb 04                \\tjmp    0x24\\n  20:\\t39 ca                \\tcmp    %ecx,%edx\\n  22:\\t73 37                \\tjae    0x5b\\n  24:\\t4d 8b 39             \\tmov    (%r9),%r15\\n  27:\\t83 c7 01             \\tadd    $0x1,%edi\\n  2a:*\\t49 8b 17             \\tmov    (%r15),%rdx\\t\\t\u003c-- trapping instruction\\n  2d:\\t49 89 11             \\tmov    %rdx,(%r9)\\n  30:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n  34:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n  38:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  3f:\\t49                   \\trex.WB\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t49 8b 17             \\tmov    (%r15),%rdx\\n   3:\\t49 89 11             \\tmov    %rdx,(%r9)\\n   6:\\t41 8b 57 28          \\tmov    0x28(%r15),%edx\\n   a:\\t45 8b 5f 34          \\tmov    0x34(%r15),%r11d\\n   e:\\t49 c7 07 00 00 00 00 \\tmovq   $0x0,(%r15)\\n  15:\\t49                   \\trex.WB\\n[   70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202\\n[   70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000\\n[   70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\\n[   70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000\\n[   70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58\\n[   70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000\\n[   70.724561] FS:  000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000\\n[   70.724561] CS:  0010 DS: 0000 ES: 0000 C\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"4.19.218\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"5.4.162\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"5.10.82\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"5.15.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.256\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:59:12.810Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49949\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:23:29.408Z\", \"dateReserved\": \"2024-10-21T12:17:06.046Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:02:05.756Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.