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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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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{
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          "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",
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            "version": "3.1"
          },
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            {
              "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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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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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    "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": "2026-09-16",
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      "cve": "CVE-2026-74667",
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      "initial_release_date": "2026-08-24T01:04:27.000Z",
      "product_status:fixed": "1",
      "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": "3"
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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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:16:55Z",
      "cve": "CVE-2026-74667",
      "id": "CVE-2026-74667",
      "initial_release_date": "2026-08-23T00:04:54Z",
      "product_status:known_affected": "351",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74667",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74667.json",
      "version": "7"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.