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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.\"}], \"providerMetadata\": {\"dateUpdated\": \"2026-11-03T19:12:54.971Z\", \"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\"}, \"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\"}], \"title\": \"asymmetric_keys: reject trust keys without IDs\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}}, \"cveMetadata\": {\"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"assignerShortName\": \"Linux\", \"cveId\": \"CVE-2026-99220\", \"datePublished\": \"2026-11-02T16:06:31.966Z\", \"dateReserved\": \"2026-09-25T10:25:14.401Z\", \"dateUpdated\": \"2026-11-03T19:12:54.971Z\", \"state\": \"PUBLISHED\"}, \"dataType\": \"CVE_RECORD\", \"dataVersion\": 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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."}],"providerMetadata":{"dateUpdated":"2026-11-03T19:12:54.971Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"asymmetric_keys: reject trust keys without IDs","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99220","datePublished":"2026-11-02T16:06:31.966Z","dateReserved":"2026-09-25T10:25:14.401Z","dateUpdated":"2026-11-03T19:12:54.971Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"cna_checked":1794500401,"cve":"CVE-2026-99220","description":"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 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.","epss":{"date":"2026-11-12","epss":0.00122,"percentile":0.01972},"epss_checked":1794522003,"first_seen":1794378631,"kev":null,"kev_checked":1794522003,"products":"Linux Linux","references":["https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128","https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935","https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752","https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b","https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818","https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651","https://git.kernel.org/stable/c/9695df3b1db4ac4534274d38ee16e3b9b0bf910e"],"score":null,"solutions":"","state":"PUBLISHED","title":"asymmetric_keys: reject trust keys without IDs","updated_at":1794500401,"workarounds":""},"sources":[{"canonical_url":"https://www.bleepingcomputer.com/news/microsoft/microsoft-november-2026-patch-tuesday-fixes-1-235-flaws-outlook-zero-day/","id":375,"publisher":"BleepingComputer","title":"Microsoft November 2026 Patch Tuesday fixes 1,235 flaws, Outlook zero-day"}]}