CVE-2026-99226 (GCVE-0-2026-99226)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:12
VLAI
Title
keys: Avoid the owner account dereference in named keyring lookup
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: Avoid the owner account dereference in named keyring lookup Named keyring lookup must keep the storage containing the owner UID alive through the namespace mapping check. find_keyring_by_name() reads keyring->user->uid under keyring_name_lock, but that lock protects the keyring's name entry and allocation, not its separate key_user. A named session-keyring join can overlap a privileged KEYCTL_CHOWN on another CPU. If the keyring holds the last reference to its old dynamic key_user and the ownership transfer succeeds, the following ordering is possible: Named join Chown find_keyring_by_name() keyctl_chown_key() read_lock(keyring_name_lock) down_write(key->sem) load old keyring->user replace key->user and key->uid up_write(key->sem) key_put(key) key_user_put(old user): free read old user->uid read_unlock(keyring_name_lock) Chown neither takes keyring_name_lock nor key_session_mutex, so it can free the old account between the pointer load and the UID read. The lookup then reads freed memory even though the keyring itself is alive. Use keyring->uid for the mapping check. key_alloc() initializes this inline owner UID and keyctl_chown_key() updates it on chown. The existing name lock keeps its containing keyring allocated throughout the check, so lookup no longer depends on the account's lifetime. This also matches the owner UID used by the permission check. KASAN report as below: BUG: KASAN: slab-use-after-free in find_keyring_by_name+0x577/0x5d0 Read of size 4 at addr ffff8881128ae2ec by task keycase/500
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 77249d4b1bb5ad43552b7023c4a0978937aa7a56 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 0b865fa477d94ac96c26848aab1fd176397de3f6 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 6763329f673d261641c79212abf773af77b2c922 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < aa03c8fb4334f14d218020f7431debf2b7766865 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < c9664f780f861dd9f11f120c7a03ed0993671ebb (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < b0830a26e2c3008a6e21863126b4a0e68b2761cd (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 5c6a9512887a6cc694d594d9c0b57c0841d215b5 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 40b12b93ae4ab9e22c3d571e9b09fd08afad53f6 (git)
Affected: 2ea190d0a006ce5218baa6e798512652446a605a , < 51409aaa01f8602552c336009fd22b226b0cdf1d (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.60 , ≤ 6.18.* (semver)
Unaffected: 7.2.14 , ≤ 7.2.* (semver)
Unaffected: 7.3.1 , ≤ 7.3.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Avoid the owner account dereference in named keyring lookup\n\nNamed keyring lookup must keep the storage containing the owner UID\nalive through the namespace mapping check.  find_keyring_by_name()\nreads keyring-\u003euser-\u003euid under keyring_name_lock, but that lock protects\nthe keyring\u0027s name entry and allocation, not its separate key_user.\n\nA named session-keyring join can overlap a privileged KEYCTL_CHOWN on\nanother CPU.  If the keyring holds the last reference to its old dynamic\nkey_user and the ownership transfer succeeds, the following ordering is\npossible:\n\n    Named join                         Chown\n    find_keyring_by_name()              keyctl_chown_key()\n      read_lock(keyring_name_lock)       down_write(key-\u003esem)\n      load old keyring-\u003euser\n                                         replace key-\u003euser and key-\u003euid\n                                         up_write(key-\u003esem)\n                                         key_put(key)\n                                         key_user_put(old user): free\n      read old user-\u003euid\n      read_unlock(keyring_name_lock)\n\nChown neither takes keyring_name_lock nor key_session_mutex, so it can\nfree the old account between the pointer load and the UID read.  The\nlookup then reads freed memory even though the keyring itself is alive.\n\nUse keyring-\u003euid for the mapping check.  key_alloc() initializes this\ninline owner UID and keyctl_chown_key() updates it on chown.\nThe existing name lock keeps its containing keyring allocated throughout\nthe check, so lookup no longer depends on the account\u0027s lifetime.  This\nalso matches the owner UID used by the permission check.\n\nKASAN report as below:\n\n    BUG: KASAN: slab-use-after-free in find_keyring_by_name+0x577/0x5d0\n    Read of size 4 at addr ffff8881128ae2ec by task keycase/500"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Avoid the owner account dereference in named keyring lookup\n\nNamed keyring lookup must keep the storage containing the owner UID\nalive through the namespace mapping check.  find_keyring_by_name()\nreads keyring-\u003euser-\u003euid under keyring_name_lock, but that lock protects\nthe keyring\u0027s name entry and allocation, not its separate key_user.\n\nA named session-keyring join can overlap a privileged KEYCTL_CHOWN on\nanother CPU.  If the keyring holds the last reference to its old dynamic\nkey_user and the ownership transfer succeeds, the following ordering is\npossible:\n\n    Named join                         Chown\n    find_keyring_by_name()              keyctl_chown_key()\n      read_lock(keyring_name_lock)       down_write(key-\u003esem)\n      load old keyring-\u003euser\n                                         replace key-\u003euser and key-\u003euid\n                                         up_write(key-\u003esem)\n                                         key_put(key)\n                                         key_user_put(old user): free\n      read old user-\u003euid\n      read_unlock(keyring_name_lock)\n\nChown neither takes keyring_name_lock nor key_session_mutex, so it can\nfree the old account between the pointer load and the UID read.  The\nlookup then reads freed memory even though the keyring itself is alive.\n\nUse keyring-\u003euid for the mapping check.  key_alloc() initializes this\ninline owner UID and keyctl_chown_key() updates it on chown.\nThe existing name lock keeps its containing keyring allocated throughout\nthe check, so lookup no longer depends on the account\u0027s lifetime.  This\nalso matches the owner UID used by the permission check.\n\nKASAN report as below:\n\n    BUG: KASAN: slab-use-after-free in find_keyring_by_name+0x577/0x5d0\n    Read of size 4 at addr ffff8881128ae2ec by task keycase/500"
          }
        ],
        "id": "CVE-2026-99226",
        "lastModified": "2026-11-03T20:18:28.183",
        "metrics": {},
        "published": "2026-11-02T16:17:47.233",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-04T12:48:14+00:00",
      "cve": "CVE-2026-99226",
      "id": "CVE-2026-99226",
      "initial_release_date": "2026-11-02T16:06:35.362000+00:00",
      "product_status:known_affected": "280",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via use-after-free in named keyring lookup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99226.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-03T17:34:01Z",
      "cve": "CVE-2026-99226",
      "id": "CVE-2026-99226",
      "initial_release_date": "2026-11-03T17:34:01Z",
      "product_status:known_affected": "345",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99226",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99226.json",
      "version": "2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.