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net: guard timestamp cmsgs to real error queue skbs

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.

Announced Source revision 1
Original source ↗

CVE-2026-53223

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-2026-53223

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": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "24a0d548d3a765cd4558224e4f8e06e14cba26e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "71ff5cdd5da61d0438e902aa0fd68c28bc901abe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "ad9a0374ee6d11048e1f74cd5180bad58b9848b4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "b903e9b5629ec8dd6db92174070045bf81ad7060",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "e0665b2a8e90bb08bd205062c75662b502d31797",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "3dde4fb941fa5649ab809f6cd3e20e0c424a4e31",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8605330aac5a5785630aec8f64378a54891937cc",
        "lessThan": "1ee90b77b727df903033db873c75caac5c27ec98",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdaf15b43bd31003220cb080bcbbd57787a2fca9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.10.14",
        "lessThan": "4.11",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "include/net/sock.h",
      "net/core/skbuff.c",
      "net/socket.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/sock.h",
      "net/core/skbuff.c",
      "net/socket.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53223

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40785 · Revision 1
Added to Heist Feed
Publisher date
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