CVE-2026-74684 (GCVE-0-2026-74684)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-10-21 12:46
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp() The commit 4f61f133f354 ("net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null") fixed a crash in tap_get_user() by assigning skb->dev before calling tun_vnet_hdr_to_skb(). This is required because virtio_net_hdr_to_skb() may invoke dev_parse_header_protocol(), which dereferences skb->dev. Without the assignment, a NULL pointer dereference can occur. However, tap_get_user_xdp() still parses the virtio-net header before assigning skb->dev. When the vhost TX path passes an XDP buffer containing a GSO virtio-net header but the protocol is set to zero on purpose, tun_vnet_hdr_to_skb() can reach dev_parse_header_protocol() while skb->dev is still NULL, resulting in a crash. Fix this by looking up the tap device and assigning skb->dev before calling tun_vnet_hdr_to_skb(), matching the ordering already used in tap_get_user(). Preserve the existing RCU read-side critical section across dev_queue_xmit().
References
Impacted products
Vendor Product Version
Linux Linux Version: 924a9bc362a5223cd448ca08c3dde21235adc310
Version: 924a9bc362a5223cd448ca08c3dde21235adc310
Version: 924a9bc362a5223cd448ca08c3dde21235adc310
Version: 924a9bc362a5223cd448ca08c3dde21235adc310
Version: 924a9bc362a5223cd448ca08c3dde21235adc310
Version: ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d
Version: 54ef8243c3c8e90f1ea5792e6752e021a25c8eb3
Version: ca278267d6cd9544645731732455b6b20cb0e895
Version: faa3baa2828c5e1c4374f3e60041f75c64f5fcb6
Version: 99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748
Version: 4.14.226   ≤
Version: 4.19.181   ≤
Version: 5.4.106   ≤
Version: 5.10.24   ≤
Version: 5.11.7   ≤
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              "value": "AV:L - A malicious KVM guest reaches tap_get_user_xdp() by kicking the virtio-net TX virtqueue; vhost_net handle_tx_copy batches XDP buffers and invokes tap_sendmsg(TUN_MSG_PTR), not via any host network packet-receive path.\nAC:L - On typical QEMU/KVM vhost-net+tap/macvtap backends with TX batching enabled, a guest fully controls virtio-net GSO headers and Ethernet frames; sending GSO with ethertype 0 deterministically hits dev_parse_header_protocol() with skb-\u003edev NULL without races.\nPR:N - No host root or capabilities are required; a malicious cloud VM tenant only needs code execution inside a guest using virtio-net with a vhost-net tap backend, matching other guest-to-host virtio/KVM CNA scores.\nUI:N - No separate victim action is needed; the attacker submits crafted virtio-net TX descriptors from their own guest workload during normal VM operation without requiring host administrator interaction.\nS:C - Guest-supplied virtio-net TX data triggers a NULL pointer dereference in host tap_get_user_xdp(), panicking the physical host kernel and crossing the KVM guest-to-host virtualization security boundary.\nC:N - The failure mode is a NULL pointer dereference at dev-\u003eheader_ops with skb-\u003edev unset; there is no demonstrated out-of-bounds read, use-after-free, or other memory corruption that could disclose host kernel data.\nI:N - No guest-controlled host memory write or control-flow hijack occurs; the host kernel oopses on the NULL dereference before any exploitable modification beyond the immediate crash.\nA:H - The NULL pointer dereference in dev_parse_header_protocol() provokes a host kernel oops/panic in the vhost worker during guest virtio-net TX, denying availability of the hypervisor and all co-resident VMs."
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    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-10-21T12:46:07.263Z",
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the host kernel oopses on the NULL dereference before any exploitable modification beyond the immediate crash.\\nA:H - The NULL pointer dereference in dev_parse_header_protocol() provokes a host kernel oops/panic in the vhost worker during guest virtio-net TX, denying availability of the hypervisor and all co-resident VMs.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"924a9bc362a5223cd448ca08c3dde21235adc310\", \"lessThan\": \"61dd022c55c7307ec119e5672cb141cccbecf3b1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"924a9bc362a5223cd448ca08c3dde21235adc310\", \"lessThan\": \"15583b07fd691a844fbf7b3ad612cdc9e9a657c0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"924a9bc362a5223cd448ca08c3dde21235adc310\", \"lessThan\": \"8b444b126cd8e4473e652f529753ed4dd1360a9c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"924a9bc362a5223cd448ca08c3dde21235adc310\", \"lessThan\": \"164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"924a9bc362a5223cd448ca08c3dde21235adc310\", \"lessThan\": \"3874892dd27d5387aa9a06f58d9060f18f351d24\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54ef8243c3c8e90f1ea5792e6752e021a25c8eb3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca278267d6cd9544645731732455b6b20cb0e895\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"faa3baa2828c5e1c4374f3e60041f75c64f5fcb6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.14.226\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.181\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.106\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.24\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.11.7\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/net/tap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.105\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.45\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/tap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/61dd022c55c7307ec119e5672cb141cccbecf3b1\"}, {\"url\": \"https://git.kernel.org/stable/c/15583b07fd691a844fbf7b3ad612cdc9e9a657c0\"}, {\"url\": \"https://git.kernel.org/stable/c/8b444b126cd8e4473e652f529753ed4dd1360a9c\"}, {\"url\": \"https://git.kernel.org/stable/c/164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b\"}, {\"url\": \"https://git.kernel.org/stable/c/3874892dd27d5387aa9a06f58d9060f18f351d24\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: tap: set skb-\u003edev before parsing virtio net header in tap_get_user_xdp()\\n\\nThe commit 4f61f133f354 (\\\"net: tap: NULL pointer derefence in\\ndev_parse_header_protocol when skb-\u003edev is null\\\") fixed a crash in\\ntap_get_user() by assigning skb-\u003edev before calling tun_vnet_hdr_to_skb().\\nThis is required because virtio_net_hdr_to_skb() may invoke\\ndev_parse_header_protocol(), which dereferences skb-\u003edev. Without the\\nassignment, a NULL pointer dereference can occur.\\n\\nHowever, tap_get_user_xdp() still parses the virtio-net header before\\nassigning skb-\u003edev. When the vhost TX path passes an XDP buffer containing\\na GSO virtio-net header but the protocol is set to zero on purpose,\\ntun_vnet_hdr_to_skb() can reach dev_parse_header_protocol() while skb-\u003edev\\nis still NULL, resulting in a crash.\\n\\nFix this by looking up the tap device and assigning skb-\u003edev before calling\\ntun_vnet_hdr_to_skb(), matching the ordering already used in\\ntap_get_user(). Preserve the existing RCU read-side critical section across\\ndev_queue_xmit().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.105\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.45\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.9\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.226\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.181\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.106\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.11.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:46:07.263Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74684\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:46:07.263Z\", \"dateReserved\": \"2026-08-15T05:44:03.926Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-22T15:32:50.846Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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