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net/packet: defer vmalloc TX_RING free until skbs finish

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/packet: defer vmalloc TX_RING free until skbs finish AF_PACKET TX_RING skbs keep a raw pointer to their ring frame. The skb page references preserve page-backed ring blocks after pg_vec is freed, but they do not preserve a vmalloc mapping. tpacket_destruct_skb() currently drops the pending reference before writing the timestamp and TP_STATUS_AVAILABLE to the frame. Move the decrement after those stores. The smp_wmb() in __packet_set_status() orders the frame stores before the decrement. Also recheck pending TX frames under pg_vec_lock before non-closing ring replacement, so a racing send cannot add a pending skb between the initial check and the ring swap. Ring allocation can produce a mixture of page-backed and vmalloc-backed blocks. Allocate deferred-work storage during TX ring setup when the first vmalloc-backed block is encountered, and keep its pointer in the pg_vec allocation header. If allocation fails, return -ENOMEM from ring setup. On socket close, a non-NULL pointer identifies a vmalloc-backed vector without a scan. If TX skbs remain, defer the whole vector to system_long_wq. After pg_vec is detached, a late destructor can skip the pending decrement. Use socket write-memory accounting as the deferred lifetime gate instead: an skb remains charged through its final sock_wfree(), after all ring-frame accesses. The delayed work retains a socket reference and reschedules itself until no TX skbs rema

Announced Source revision 1
Original source ↗

CVE-2026-80841

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-2026-80841

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "debf9f50140b3df3949ebcb97d4450f8993fe32d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "4ce6e2d2e38055b2012bd5fdb0c8a8183c8a1b0c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "0189dce07db2dc059ae0570e06758ec4233c6e11",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "550d00aa58193fb649a09a9c9e338c685adad784",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b013840810c221f2b0cf641d01531526052dc1fb",
        "lessThan": "992cc9f94ca924089a506ba9b327caa9af797529",
        "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": "3.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/packet/af_packet.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80841

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34857 · Revision 1
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