CVE-2026-74667 (GCVE-0-2026-74667)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
Title
net/packet: reset the MAC header on the packet-socket transmit path
Summary
In the Linux kernel, the following vulnerability has been resolved: net/packet: reset the MAC header on the packet-socket transmit path packet_parse_headers() resets the MAC header only for a SOCK_RAW frame whose socket did not bind a protocol. A protocol-bound SOCK_RAW socket, any SOCK_DGRAM frame, and the legacy SOCK_PACKET path therefore leave skb->mac_header unset here. For frames sent via __dev_queue_xmit() this is harmless: it resets the MAC header unconditionally. But the packet-socket PACKET_QDISC_BYPASS path uses dev_direct_xmit(), which does not, so the frame reaches ndo_start_xmit() with the MAC header unset. A driver that reads eth_hdr(skb) on transmit then dereferences skb->head + (u16)~0, an out-of-bounds access ~64 KiB past the head -- the same class fixed for one consumer in commit f5089008f90c ("macsec: do not read an unset MAC header in macsec_encrypt()"). packet_parse_headers() runs only on the transmit path, where skb->data points at the start of the L2 header for every packet-socket type regardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied header and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC header unconditionally, mirroring __dev_queue_xmit(), so the frame is anchored on the bypass path too. Found by 0sec (https://0sec.ai) using automated source analysis; verified against source and matched to the macsec KASAN report in f5089008f90c. Compile-tested.
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 CPE status
Linux Linux Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < 1e43a1d66615f411d427f9df1f46dd049d9e3681 (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < 4057853a91fb796c4f47c7d1baf1aa085394148e (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < 2610ed4e86a4590234a9d70518c469751c5af231 (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < b47ba8fe6e1d2df8c92048de5afafd059447dc30 (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < 284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < 971aa7d99242bbf09513e27b7a243f0b29ff23ae (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < fdd4d7d52358a58e351dd9d82530c04eba8ccd7a (git)
Affected: 75c65772c3d18447d62d3aca5f91b06c16cc25e4 , < c2707480cfbf19c7619acc9c089d17f20869821f (git)
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Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: reset the MAC header on the packet-socket transmit path\n\npacket_parse_headers() resets the MAC header only for a SOCK_RAW frame\nwhose socket did not bind a protocol. A protocol-bound SOCK_RAW socket,\nany SOCK_DGRAM frame, and the legacy SOCK_PACKET path therefore leave\nskb-\u003emac_header unset here.\n\nFor frames sent via __dev_queue_xmit() this is harmless: it resets the\nMAC header unconditionally. But the packet-socket PACKET_QDISC_BYPASS\npath uses dev_direct_xmit(), which does not, so the frame reaches\nndo_start_xmit() with the MAC header unset. A driver that reads\neth_hdr(skb) on transmit then dereferences skb-\u003ehead + (u16)~0, an\nout-of-bounds access ~64 KiB past the head -- the same class fixed for\none consumer in commit f5089008f90c (\"macsec: do not read an unset MAC\nheader in macsec_encrypt()\").\n\npacket_parse_headers() runs only on the transmit path, where skb-\u003edata\npoints at the start of the L2 header for every packet-socket type\nregardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied\nheader and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC\nheader unconditionally, mirroring __dev_queue_xmit(), so the frame is\nanchored on the bypass path too.\n\nFound by 0sec (https://0sec.ai) using automated source analysis;\nverified against source and matched to the macsec KASAN report in\nf5089008f90c. Compile-tested."
        }
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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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached only via local AF_PACKET transmit syscalls (sendmsg on SOCK_DGRAM/bound SOCK_RAW with PACKET_QDISC_BYPASS); remote network input cannot trigger packet_parse_headers() on this TX path.\nAC:L - The attacker controls socket type, enables PACKET_QDISC_BYPASS via setsockopt, selects a vulnerable netdev (macsec/macvlan/tap), and sends frames to reliably hit dev_direct_xmit() without races or external victim state.\nPR:L - packet_create() requires CAP_NET_RAW, which unprivileged users commonly obtain inside user+network namespaces (unshare -Urn) per kernel capability rules, not solely real root in the init namespace.\nUI:N - Exploitation requires only the attacker opening a packet socket, enabling bypass, and transmitting; no victim user action such as opening files or mounting filesystems is needed.\nS:U - Impact is kernel heap/slab disclosure and transmit-time corruption within the same kernel security authority; it is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - Unset mac_header makes eth_hdr(skb) a large out-of-bounds kernel memory read (~64 KiB past skb-\u003ehead); macsec KASAN confirmed slab data leakage and bytes can be emitted on the wire in the frame.\nI:H - Affected TX drivers consume the bogus eth_hdr() pointer to modify skbs (e.g., macsec memmove of OOB MAC bytes into the frame, vxlan header rewrites), giving attacker-influenced corruption beyond a pure read.\nA:H - The invalid mac_header dereference can fault or trigger KASAN/driver failures during ndo_start_xmit(), causing kernel oops/panic or repeated transmit failure on the bypass path."
            }
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        "dateUpdated": "2026-08-25T05:41:21.641Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1e43a1d66615f411d427f9df1f46dd049d9e3681"
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          "url": "https://git.kernel.org/stable/c/4057853a91fb796c4f47c7d1baf1aa085394148e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c2707480cfbf19c7619acc9c089d17f20869821f"
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      ],
      "title": "net/packet: reset the MAC header on the packet-socket transmit path",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74667",
    "datePublished": "2026-08-22T15:32:38.862Z",
    "dateReserved": "2026-08-15T05:44:03.924Z",
    "dateUpdated": "2026-08-25T05:41:21.641Z",
    "state": "PUBLISHED"
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      "date": "2026-08-29",
      "epss": "0.00136",
      "percentile": "0.03305"
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      "cve": "CVE-2026-74667",
      "id": "msrc_CVE-2026-74667",
      "initial_release_date": "2026-08-24T01:04:27.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/packet: reset the MAC header on the packet-socket transmit path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74667.json",
      "version": "2"
    },
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A driver that reads\\neth_hdr(skb) on transmit then dereferences skb-\u003ehead + (u16)~0, an\\nout-of-bounds access ~64 KiB past the head -- the same class fixed for\\none consumer in commit f5089008f90c (\\\"macsec: do not read an unset MAC\\nheader in macsec_encrypt()\\\").\\n\\npacket_parse_headers() runs only on the transmit path, where skb-\u003edata\\npoints at the start of the L2 header for every packet-socket type\\nregardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied\\nheader and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC\\nheader unconditionally, mirroring __dev_queue_xmit(), so the frame is\\nanchored on the bypass path too.\\n\\nFound by 0sec (https://0sec.ai) using automated source analysis;\\nverified against source and matched to the macsec KASAN report in\\nf5089008f90c. Compile-tested.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/packet/af_packet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"1e43a1d66615f411d427f9df1f46dd049d9e3681\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"4057853a91fb796c4f47c7d1baf1aa085394148e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"2610ed4e86a4590234a9d70518c469751c5af231\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"b47ba8fe6e1d2df8c92048de5afafd059447dc30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"971aa7d99242bbf09513e27b7a243f0b29ff23ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"fdd4d7d52358a58e351dd9d82530c04eba8ccd7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75c65772c3d18447d62d3aca5f91b06c16cc25e4\",\"lessThan\":\"c2707480cfbf19c7619acc9c089d17f20869821f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/packet/af_packet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1e43a1d66615f411d427f9df1f46dd049d9e3681\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2610ed4e86a4590234a9d70518c469751c5af231\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4057853a91fb796c4f47c7d1baf1aa085394148e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/971aa7d99242bbf09513e27b7a243f0b29ff23ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b47ba8fe6e1d2df8c92048de5afafd059447dc30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2707480cfbf19c7619acc9c089d17f20869821f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fdd4d7d52358a58e351dd9d82530c04eba8ccd7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:53:49+00:00",
      "cve": "CVE-2026-74667",
      "id": "CVE-2026-74667",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/packet: reset the MAC header on the packet-socket transmit path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74667.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.