Skip to content
Heist/ feed
High

packet: use consistent hard_header_len in TX_RING send path

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in TX_RING send path tpacket_snd() reads dev->hard_header_len independently for skb allocation and header construction in tpacket_fill_skb(). Concurrent netdevice reconfiguration can therefore make the reserved headroom smaller than the amount later pushed, or make copylen - hard_header_len negative. Snapshot hard_header_len once before processing ring frames and use it for the frame limit, headroom allocation, copy length, and skb construction. Pass the snapshot to tpacket_fill_skb(). The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.

Announced Source revision 1
Original source ↗

CVE-2026-74668

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74668

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "9c7e8ff48c377bef18c3d178748aea0575b69ede",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "2a73b2c37ee3060a880b53cd24783d93fc7be5f8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "d85d2fd54e901637c81d847811e03c662aee13cd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "016763e829cac37b3234eace86fd0a4c560de4a7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "27e068d1b35dbec10a3cf268887c94407be4badc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "d48ea5c9c4c34dc0df621f0e39ed3a16b644621a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
        "lessThan": "21b5953e7494c16a42e6cd8cf110e18d13ae4a6b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/packet/af_packet.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.31"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.31",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.267",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.218",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.185",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "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": [
      "net/packet/af_packet.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74668

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34266 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement