CVE-2026-31469 (GCVE-0-2026-31469)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-05-11 22:09
VLAI?
Title
virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false A UAF issue occurs when the virtio_net driver is configured with napi_tx=N and the device's IFF_XMIT_DST_RELEASE flag is cleared (e.g., during the configuration of tc route filter rules). When IFF_XMIT_DST_RELEASE is removed from the net_device, the network stack expects the driver to hold the reference to skb->dst until the packet is fully transmitted and freed. In virtio_net with napi_tx=N, skbs may remain in the virtio transmit ring for an extended period. If the network namespace is destroyed while these skbs are still pending, the corresponding dst_ops structure has freed. When a subsequent packet is transmitted, free_old_xmit() is triggered to clean up old skbs. It then calls dst_release() on the skb associated with the stale dst_entry. Since the dst_ops (referenced by the dst_entry) has already been freed, a UAF kernel paging request occurs. fix it by adds skb_dst_drop(skb) in start_xmit to explicitly release the dst reference before the skb is queued in virtio_net. Call Trace: Unable to handle kernel paging request at virtual address ffff80007e150000 CPU: 2 UID: 0 PID: 6236 Comm: ping Kdump: loaded Not tainted 7.0.0-rc1+ #6 PREEMPT ... percpu_counter_add_batch+0x3c/0x158 lib/percpu_counter.c:98 (P) dst_release+0xe0/0x110 net/core/dst.c:177 skb_release_head_state+0xe8/0x108 net/core/skbuff.c:1177 sk_skb_reason_drop+0x54/0x2d8 net/core/skbuff.c:1255 dev_kfree_skb_any_reason+0x64/0x78 net/core/dev.c:3469 napi_consume_skb+0x1c4/0x3a0 net/core/skbuff.c:1527 __free_old_xmit+0x164/0x230 drivers/net/virtio_net.c:611 [virtio_net] free_old_xmit drivers/net/virtio_net.c:1081 [virtio_net] start_xmit+0x7c/0x530 drivers/net/virtio_net.c:3329 [virtio_net] ... Reproduction Steps: NETDEV="enp3s0" config_qdisc_route_filter() { tc qdisc del dev $NETDEV root tc qdisc add dev $NETDEV root handle 1: prio tc filter add dev $NETDEV parent 1:0 \ protocol ip prio 100 route to 100 flowid 1:1 ip route add 192.168.1.100/32 dev $NETDEV realm 100 } test_ns() { ip netns add testns ip link set $NETDEV netns testns ip netns exec testns ifconfig $NETDEV 10.0.32.46/24 ip netns exec testns ping -c 1 10.0.32.1 ip netns del testns } config_qdisc_route_filter test_ns sleep 2 test_ns
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < be0e63f3b97bbaf453c542e8a15ba2a536e2ac01 (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < c1ec36cb3768574b916f20d2d7415fd14fa1bf12 (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < 8a4790850e710fd6771e4d2112168ed1dd6c0e54 (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < fedd2e1630cac920844997227ccbe7b26a76375a (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < f04733c4dc40c43899c3d1c97afbae5831a3770f (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < 9a18629f2525781f0f3dda7be72b204e4cf77d08 (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < 63d45077b97bb0e0fe0c75931acbbca7a47af141 (git)
Affected: f2fc6a54585a1be6669613a31fbaba2ecbadcd36 , < ba8bda9a0896746053aa97ac6c3e08168729172c (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false\n\nA UAF issue occurs when the virtio_net driver is configured with napi_tx=N\nand the device\u0027s IFF_XMIT_DST_RELEASE flag is cleared\n(e.g., during the configuration of tc route filter rules).\n\nWhen IFF_XMIT_DST_RELEASE is removed from the net_device, the network stack\nexpects the driver to hold the reference to skb-\u003edst until the packet\nis fully transmitted and freed. In virtio_net with napi_tx=N,\nskbs may remain in the virtio transmit ring for an extended period.\n\nIf the network namespace is destroyed while these skbs are still pending,\nthe corresponding dst_ops structure has freed. When a subsequent packet\nis transmitted, free_old_xmit() is triggered to clean up old skbs.\nIt then calls dst_release() on the skb associated with the stale dst_entry.\nSince the dst_ops (referenced by the dst_entry) has already been freed,\na UAF kernel paging request occurs.\n\nfix it by adds skb_dst_drop(skb) in start_xmit to explicitly release\nthe dst reference before the skb is queued in virtio_net.\n\nCall Trace:\n Unable to handle kernel paging request at virtual address ffff80007e150000\n CPU: 2 UID: 0 PID: 6236 Comm: ping Kdump: loaded Not tainted 7.0.0-rc1+ #6 PREEMPT\n  ...\n  percpu_counter_add_batch+0x3c/0x158 lib/percpu_counter.c:98 (P)\n  dst_release+0xe0/0x110  net/core/dst.c:177\n  skb_release_head_state+0xe8/0x108 net/core/skbuff.c:1177\n  sk_skb_reason_drop+0x54/0x2d8 net/core/skbuff.c:1255\n  dev_kfree_skb_any_reason+0x64/0x78 net/core/dev.c:3469\n  napi_consume_skb+0x1c4/0x3a0 net/core/skbuff.c:1527\n  __free_old_xmit+0x164/0x230  drivers/net/virtio_net.c:611 [virtio_net]\n  free_old_xmit drivers/net/virtio_net.c:1081 [virtio_net]\n  start_xmit+0x7c/0x530 drivers/net/virtio_net.c:3329 [virtio_net]\n  ...\n\nReproduction Steps:\nNETDEV=\"enp3s0\"\n\nconfig_qdisc_route_filter() {\n    tc qdisc del dev $NETDEV root\n    tc qdisc add dev $NETDEV root handle 1: prio\n    tc filter add dev $NETDEV parent 1:0 \\\n\tprotocol ip prio 100 route to 100 flowid 1:1\n    ip route add 192.168.1.100/32 dev $NETDEV realm 100\n}\n\ntest_ns() {\n    ip netns add testns\n    ip link set $NETDEV netns testns\n    ip netns exec testns ifconfig $NETDEV  10.0.32.46/24\n    ip netns exec testns ping -c 1 10.0.32.1\n    ip netns del testns\n}\n\nconfig_qdisc_route_filter\n\ntest_ns\nsleep 2\ntest_ns"
        }
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      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:09:20.343Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/be0e63f3b97bbaf453c542e8a15ba2a536e2ac01"
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        {
          "url": "https://git.kernel.org/stable/c/9a18629f2525781f0f3dda7be72b204e4cf77d08"
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        {
          "url": "https://git.kernel.org/stable/c/63d45077b97bb0e0fe0c75931acbbca7a47af141"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba8bda9a0896746053aa97ac6c3e08168729172c"
        }
      ],
      "title": "virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31469",
    "datePublished": "2026-04-22T13:53:58.266Z",
    "dateReserved": "2026-03-09T15:48:24.097Z",
    "dateUpdated": "2026-05-11T22:09:20.343Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-31469",
      "date": "2026-05-24",
      "epss": "0.00015",
      "percentile": "0.03659"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31469\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:43.260\",\"lastModified\":\"2026-05-07T18:18:57.993\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvirtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false\\n\\nA UAF issue occurs when the virtio_net driver is configured with napi_tx=N\\nand the device\u0027s IFF_XMIT_DST_RELEASE flag is cleared\\n(e.g., during the configuration of tc route filter rules).\\n\\nWhen IFF_XMIT_DST_RELEASE is removed from the net_device, the network stack\\nexpects the driver to hold the reference to skb-\u003edst until the packet\\nis fully transmitted and freed. In virtio_net with napi_tx=N,\\nskbs may remain in the virtio transmit ring for an extended period.\\n\\nIf the network namespace is destroyed while these skbs are still pending,\\nthe corresponding dst_ops structure has freed. When a subsequent packet\\nis transmitted, free_old_xmit() is triggered to clean up old skbs.\\nIt then calls dst_release() on the skb associated with the stale dst_entry.\\nSince the dst_ops (referenced by the dst_entry) has already been freed,\\na UAF kernel paging request occurs.\\n\\nfix it by adds skb_dst_drop(skb) in start_xmit to explicitly release\\nthe dst reference before the skb is queued in virtio_net.\\n\\nCall Trace:\\n Unable to handle kernel paging request at virtual address ffff80007e150000\\n CPU: 2 UID: 0 PID: 6236 Comm: ping Kdump: loaded Not tainted 7.0.0-rc1+ #6 PREEMPT\\n  ...\\n  percpu_counter_add_batch+0x3c/0x158 lib/percpu_counter.c:98 (P)\\n  dst_release+0xe0/0x110  net/core/dst.c:177\\n  skb_release_head_state+0xe8/0x108 net/core/skbuff.c:1177\\n  sk_skb_reason_drop+0x54/0x2d8 net/core/skbuff.c:1255\\n  dev_kfree_skb_any_reason+0x64/0x78 net/core/dev.c:3469\\n  napi_consume_skb+0x1c4/0x3a0 net/core/skbuff.c:1527\\n  __free_old_xmit+0x164/0x230  drivers/net/virtio_net.c:611 [virtio_net]\\n  free_old_xmit drivers/net/virtio_net.c:1081 [virtio_net]\\n  start_xmit+0x7c/0x530 drivers/net/virtio_net.c:3329 [virtio_net]\\n  ...\\n\\nReproduction Steps:\\nNETDEV=\\\"enp3s0\\\"\\n\\nconfig_qdisc_route_filter() {\\n    tc qdisc del dev $NETDEV root\\n    tc qdisc add dev $NETDEV root handle 1: prio\\n    tc filter add dev $NETDEV parent 1:0 \\\\\\n\\tprotocol ip prio 100 route to 100 flowid 1:1\\n    ip route add 192.168.1.100/32 dev $NETDEV realm 100\\n}\\n\\ntest_ns() {\\n    ip netns add testns\\n    ip link set $NETDEV netns testns\\n    ip netns exec testns ifconfig $NETDEV  10.0.32.46/24\\n    ip netns exec testns ping -c 1 10.0.32.1\\n    ip netns del testns\\n}\\n\\nconfig_qdisc_route_filter\\n\\ntest_ns\\nsleep 2\\ntest_ns\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.26\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"12FCCED5-075B-4D9E-9684-F4F99BF08DE6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.168\",\"matchCriteriaId\":\"E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.131\",\"matchCriteriaId\":\"CE6ED4D4-0046-4573-BFA9-D64143B6A89F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.80\",\"matchCriteriaId\":\"97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.21\",\"matchCriteriaId\":\"ED39847A-3B46-4729-B7CA-B2C30B9FA8FE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.11\",\"matchCriteriaId\":\"4CA2E747-A9EC-4518-9AA2-B4247FC748B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/63d45077b97bb0e0fe0c75931acbbca7a47af141\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8a4790850e710fd6771e4d2112168ed1dd6c0e54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a18629f2525781f0f3dda7be72b204e4cf77d08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ba8bda9a0896746053aa97ac6c3e08168729172c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/be0e63f3b97bbaf453c542e8a15ba2a536e2ac01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c1ec36cb3768574b916f20d2d7415fd14fa1bf12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f04733c4dc40c43899c3d1c97afbae5831a3770f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fedd2e1630cac920844997227ccbe7b26a76375a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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.