CVE-2026-99226

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99226", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.402Z", "datePublished": "2026-11-02T16:06:35.362Z", "dateUpdated": "2026-11-03T19:12:58.803Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T19:12:58.803Z"}, "descriptions": [{"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->user->uid under keyring_name_lock, but that lock protects\nthe keyring's 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->sem)\n load old keyring->user\n replace key->user and key->uid\n up_write(key->sem)\n key_put(key)\n key_user_put(old user): free\n read old user->uid\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->uid 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's 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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/keys/keyring.c"], "versions": [{"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "77249d4b1bb5ad43552b7023c4a0978937aa7a56", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "0b865fa477d94ac96c26848aab1fd176397de3f6", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "6763329f673d261641c79212abf773af77b2c922", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "aa03c8fb4334f14d218020f7431debf2b7766865", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "c9664f780f861dd9f11f120c7a03ed0993671ebb", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "b0830a26e2c3008a6e21863126b4a0e68b2761cd", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "5c6a9512887a6cc694d594d9c0b57c0841d215b5", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "40b12b93ae4ab9e22c3d571e9b09fd08afad53f6", "status": "affected", "versionType": "git"}, {"version": "2ea190d0a006ce5218baa6e798512652446a605a", "lessThan": "51409aaa01f8602552c336009fd22b226b0cdf1d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/keys/keyring.c"], "versions": [{"version": "2.6.30", "status": "affected"}, {"version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.60", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.14", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3.1", "lessThanOrEqual": "7.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.4-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.2.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.3.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.4-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56"}, {"url": "https://git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6"}, {"url": "https://git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922"}, {"url": "https://git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865"}, {"url": "https://git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb"}, {"url": "https://git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd"}, {"url": "https://git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5"}, {"url": "https://git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6"}, {"url": "https://git.kernel.org/stable/c/51409aaa01f8602552c336009fd22b226b0cdf1d"}], "title": "keys: Avoid the owner account dereference in named keyring lookup", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["security/keys/keyring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "77249d4b1bb5ad43552b7023c4a0978937aa7a56", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "0b865fa477d94ac96c26848aab1fd176397de3f6", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "6763329f673d261641c79212abf773af77b2c922", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "aa03c8fb4334f14d218020f7431debf2b7766865", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "c9664f780f861dd9f11f120c7a03ed0993671ebb", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "b0830a26e2c3008a6e21863126b4a0e68b2761cd", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "5c6a9512887a6cc694d594d9c0b57c0841d215b5", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "40b12b93ae4ab9e22c3d571e9b09fd08afad53f6", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}, {"lessThan": "51409aaa01f8602552c336009fd22b226b0cdf1d", "status": "affected", "version": "2ea190d0a006ce5218baa6e798512652446a605a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["security/keys/keyring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.30"}, {"lessThan": "2.6.30", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.60", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.14", "versionType": "semver"}, {"lessThanOrEqual": "7.3.*", "status": "unaffected", "version": "7.3.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.4-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"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->user->uid under keyring_name_lock, but that lock protects\nthe keyring's 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->sem)\n load old keyring->user\n replace key->user and key->uid\n up_write(key->sem)\n key_put(key)\n key_user_put(old user): free\n read old user->uid\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->uid 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's 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": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/51409aaa01f8602552c336009fd22b226b0cdf1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56"}, {"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"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via use-after-free in named keyring lookup", "id": "2565266", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565266"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's keyrings subsystem. A race condition between concurrent named keyring lookups and key ownership changes allows a local user to cause a use-after-free read. When a key's ownership is transferred while a lookup is in progress, the previous user structure can be freed before its identifier is read, potentially leading to a system crash and Denial of Service (DoS)."], "name": "CVE-2026-99226", "public_date": "2026-11-02T16:06:35Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99226\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99226\nhttps://git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6\nhttps://git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6\nhttps://git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5\nhttps://git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922\nhttps://git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56\nhttps://git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865\nhttps://git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd\nhttps://git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb"], "statement": "This vulnerability is rated as having a Moderate impact because it requires local system access and precise timing to trigger a race condition during concurrent key management operations. An unprivileged local user must perform a named session join while a concurrent privileged operation modifies key ownership on another processor, making the race window narrow and difficult to hit reliably. The blast radius is confined to a local denial of service via a kernel panic, with no direct threat to system confidentiality or integrity.", "threat_severity": "Moderate"}

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{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.224,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.191,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.161,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.115,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.60,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.14,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3.1,7.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-11-02T18:15:14.647133+00:00", "updated": "2026-11-04T15:45:15.010894+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}