{"id":"CVE-2026-99220","title":"asymmetric_keys: reject trust keys without IDs","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nasymmetric_keys: reject trust keys without IDs\n\nThe PKCS#8 parser deliberately leaves the asym_key_ids payload slot\nempty. key_or_keyring_common() unconditionally deref…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 889a2293a95f6c2880bf73b67f9b0af23251a128","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 7f0728ba89624e25df2bb80ff59bbfb545060935","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 2a40bdd4409567de4c2a141ac66439dc238af752","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 33a078f04e264eb71aa9f209cb334e4010123818","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 57e54b6939c6539d90a81c7e57531901d5991651","Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 9695df3b1db4ac4534274d38ee16e3b9b0bf910e","Linux 4.20"],"published":"2026-11-02","updated":"2026-11-03","sourceUpdated":"2026-11-03T19:12:54.971Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99220","references":[{"url":"https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128"},{"url":"https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935"},{"url":"https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752"},{"url":"https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b"},{"url":"https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818"},{"url":"https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651"},{"url":"https://git.kernel.org/stable/c/9695df3b1db4ac4534274d38ee16e3b9b0bf910e"}],"tags":["cve.org"],"epss":0.00122,"epssPercentile":0.01955,"ingestedAt":"2026-11-05T20:33:06.379Z","slug":"CVE-2026-99220","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nasymmetric_keys: reject trust keys without IDs\n\nThe PKCS#8 parser deliberately leaves the asym_key_ids payload slot\nempty. key_or_keyring_common() unconditionally dereferences that slot\nwhen a PKCS#8 key is supplied to a key_or_keyring restriction. Both the\nplain and :chain forms reach this branch, allowing an unprivileged caller\nto trigger a NULL pointer dereference through KEYCTL_RESTRICT_KEYRING\nfollowed by add_key().\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:key_or_keyring_common (crypto/asymmetric_keys/restrict.c:205 crypto/asymmetric_keys/restrict.c:279)\n Call Trace:\n  <TASK>\n  __key_create_or_update (security/keys/key.c:884)\n  key_create_or_update (security/keys/key.c:1021)\n  __do_sys_add_key (security/keys/keyctl.c:134)\n  do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n  </TASK>\n Kernel panic - not syncing: Fatal exception\n\nReject an asymmetric restriction key without key IDs. A PKCS#8 private\nkey cannot identify the signer of a candidate certificate and is not a\nvalid trust anchor.\n\n## Affected\n\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 889a2293a95f6c2880bf73b67f9b0af23251a128`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 7f0728ba89624e25df2bb80ff59bbfb545060935`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 2a40bdd4409567de4c2a141ac66439dc238af752`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 33a078f04e264eb71aa9f209cb334e4010123818`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 57e54b6939c6539d90a81c7e57531901d5991651`\n- `Linux >= 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 < 9695df3b1db4ac4534274d38ee16e3b9b0bf910e`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}