Skip to content
Heist/ feed
High

keys: Pin request_key_auth payload in instantiate paths

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: keys: Pin request_key_auth payload in instantiate paths A: request_key() B: KEYCTL_INSTANTIATE_IOV ================ ========================= create auth key store rka in auth key wait for helper get auth key load rka from auth key copy user payload sleep on #PF helper completed detach and free rka destroy auth key wake up use rka->target_key **USE-AFTER-FREE** Give request_key_auth payloads a refcount. Take a payload reference while authkey->sem stabilizes the payload and revocation state. Hold that reference across the instantiate and reject paths. Drop the auth key owning reference from revoke and destroy. [jarkko: Replaced the first two paragraphs of text with an actual concurrency scenario.]

Announced Source revision 1
Original source ↗

CVE-2026-63823

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-2026-63823

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": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "d8274181b0f28d450b42489723a5ba81042158d7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "4982bfabce6b33b3c9eddb4fb900fe5568b7cf91",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "708709c65a1832a99b0eef8ae46e343ddaca3d06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "35ab4db86774d82389e4b9559e26ab7f68d8e395",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "f9b68632ac93cc742f2e411021c4dbfe452ea0c2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "7216ce8cb12fee44e309503955bb83806b106129",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5f545c880a2a47947ba2118b2509644ab7a2969",
        "lessThan": "fd15b457a86939c38aa12116adabd8ff686c5e51",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/keys/request_key_auth-type.h",
      "security/keys/internal.h",
      "security/keys/keyctl.c",
      "security/keys/request_key_auth.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.260",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.211",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.177",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.144",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.95",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.38",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/keys/request_key_auth-type.h",
      "security/keys/internal.h",
      "security/keys/keyctl.c",
      "security/keys/request_key_auth.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63823

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40838 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement