CVE-2021-47014
Vulnerability from cvelistv5
Published
2024-02-28 08:13
Modified
2024-11-04 11:57
Severity ?
Summary
net/sched: act_ct: fix wild memory access when clearing fragments
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0648941f4c8bbf8b4b6c0b270889ae7aa769b921
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2021-47014",
                "options": [
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                "timestamp": "2024-09-10T15:58:12.683000Z",
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_ct.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "versions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: fix wild memory access when clearing fragments\n\nwhile testing re-assembly/re-fragmentation using act_ct, it\u0027s possible to\nobserve a crash like the following one:\n\n KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f]\n CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S                5.12.0-rc7+ #424\n Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017\n RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0\n Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 \u003c42\u003e 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48\n RSP: 0018:ffff888c31449db8 EFLAGS: 00010203\n RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960\n RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e\n RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350\n R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000\n R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160\n FS:  0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cIRQ\u003e\n  inet_frag_destroy+0xa9/0x150\n  call_timer_fn+0x2d/0x180\n  run_timer_softirq+0x4fe/0xe70\n  __do_softirq+0x197/0x5a0\n  irq_exit_rcu+0x1de/0x200\n  sysvec_apic_timer_interrupt+0x6b/0x80\n  \u003c/IRQ\u003e\n\nwhen act_ct temporarily stores an IP fragment, restoring the skb qdisc cb\nresults in putting random data in FRAG_CB(), and this causes those \"wild\"\nmemory accesses later, when the rbtree is purged. Never overwrite the skb\ncb in case tcf_ct_handle_fragments() returns -EINPROGRESS."
        }
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        "dateUpdated": "2024-11-04T11:57:44.498Z",
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          "url": "https://git.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806"
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      "title": "net/sched: act_ct: fix wild memory access when clearing fragments",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47014",
    "datePublished": "2024-02-28T08:13:31.513Z",
    "dateReserved": "2024-02-27T18:42:55.953Z",
    "dateUpdated": "2024-11-04T11:57:44.498Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47014\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-28T09:15:38.860\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: act_ct: fix wild memory access when clearing fragments\\n\\nwhile testing re-assembly/re-fragmentation using act_ct, it\u0027s possible to\\nobserve a crash like the following one:\\n\\n KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f]\\n CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S                5.12.0-rc7+ #424\\n Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017\\n RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0\\n Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 \u003c42\u003e 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48\\n RSP: 0018:ffff888c31449db8 EFLAGS: 00010203\\n RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960\\n RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e\\n RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350\\n R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000\\n R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160\\n FS:  0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0\\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n Call Trace:\\n  \u003cIRQ\u003e\\n  inet_frag_destroy+0xa9/0x150\\n  call_timer_fn+0x2d/0x180\\n  run_timer_softirq+0x4fe/0xe70\\n  __do_softirq+0x197/0x5a0\\n  irq_exit_rcu+0x1de/0x200\\n  sysvec_apic_timer_interrupt+0x6b/0x80\\n  \u003c/IRQ\u003e\\n\\nwhen act_ct temporarily stores an IP fragment, restoring the skb qdisc cb\\nresults in putting random data in FRAG_CB(), and this causes those \\\"wild\\\"\\nmemory accesses later, when the rbtree is purged. Never overwrite the skb\\ncb in case tcf_ct_handle_fragments() returns -EINPROGRESS.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: act_ct: corrige el acceso salvaje a la memoria al borrar fragmentos mientras se prueba el reensamblaje/refragmentaci\u00f3n usando act_ct, es posible observar un bloqueo como el siguiente: KASAN: tal vez acceso a memoria salvaje en el rango [0x0001000000000448-0x000100000000044f] CPU: 50 PID: 0 Comunicaciones: swapper/50 Tainted: GS 5.12.0-rc7+ #424 Nombre de hardware: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01 /17/2017 RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0 C\u00f3digo: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 \u0026lt;42\u0026gt; 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48 RSP: 0018:ffff888c31449db8 EFLAGS: 00010203 RAX: 00 00200000000089 RBX: 000100000000040e RCX: ffffffff989eb960 RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e RBP: 0000000000000900 R08: 00000000000000000 R09: ffffed1186289350 R10: 00000000 00000003 R11: ffffed1186289350 R12: dffffc0000000000 R13: 000100000000040e R14: 00000000000000000 R15: ffff888155e02160 FS: 00000000000000000 (0000) GS:ffff888c31440000(0000) knlGS:0000000000000000 CS : 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0 000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000000400 Seguimiento de llamadas:  inet_frag_destroy+0xa9/0x150 call_timer_fn +0x2d/0x180 run_timer_softirq+0x4fe/0xe70 __do_softirq+0x197/0x5a0 irq_exit_rcu+0x1de/0x200 sysvec_apic_timer_interrupt+0x6b/0x80  cuando act_ct almacena temporalmente un fragmento de IP, la restauraci\u00f3n de skb qdisc cb da como resultado la colocaci\u00f3n de datos aleatorios en FR AG_CB() , y esto provoca esos accesos a la memoria \\\"salvajes\\\" m\u00e1s adelante, cuando se purga el rbtree. Nunca sobrescriba el skb cb en caso de que tcf_ct_handle_fragments() devuelva -EINPROGRESS.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0648941f4c8bbf8b4b6c0b270889ae7aa769b921\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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