asymmetric_keys: reject trust keys without IDs

Description

In the Linux kernel, the following vulnerability has been resolved: asymmetric_keys: reject trust keys without IDs The PKCS#8 parser deliberately leaves the asym_key_ids payload slot empty. key_or_keyring_common() unconditionally dereferences that slot when a PKCS#8 key is supplied to a key_or_keyring restriction. Both the plain and :chain forms reach this branch, allowing an unprivileged caller to trigger a NULL pointer dereference through KEYCTL_RESTRICT_KEYRING followed by add_key(). Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:key_or_keyring_common (crypto/asymmetric_keys/restrict.c:205 crypto/asymmetric_keys/restrict.c:279) Call Trace: <TASK> __key_create_or_update (security/keys/key.c:884) key_create_or_update (security/keys/key.c:1021) __do_sys_add_key (security/keys/keyctl.c:134) do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Kernel panic - not syncing: Fatal exception Reject an asymmetric restriction key without key IDs. A PKCS#8 private key cannot identify the signer of a candidate certificate and is not a valid trust anchor.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)

0.12% · top 98% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

• Linux · Linux

  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 889a2293a95f6c2880bf73b67f9b0af23251a128
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 7f0728ba89624e25df2bb80ff59bbfb545060935
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 2a40bdd4409567de4c2a141ac66439dc238af752
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 33a078f04e264eb71aa9f209cb334e4010123818
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 57e54b6939c6539d90a81c7e57531901d5991651
  • affected 3c58b2362ba828ee2970c66c6a6fd7b04fde4413 – < 9695df3b1db4ac4534274d38ee16e3b9b0bf910e

• Linux · Linux

  • affected 4.20
  • unaffected < 4.20
  • unaffected 6.1.191 – ≤ 6.1.*
  • unaffected 6.6.161 – ≤ 6.6.*
  • unaffected 6.12.115 – ≤ 6.12.*
  • unaffected 6.18.60 – ≤ 6.18.*
  • unaffected 7.2.14 – ≤ 7.2.*
  • unaffected 7.3.1 – ≤ 7.3.*
  • unaffected 7.4-rc1 – ≤ *

References (7)

• https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128 (opens in a new tab)
• https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935 (opens in a new tab)
• https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752 (opens in a new tab)
• https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b (opens in a new tab)
• https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818 (opens in a new tab)
• https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651 (opens in a new tab)
• https://git.kernel.org/stable/c/9695df3b1db4ac4534274d38ee16e3b9b0bf910e (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-99220](https://trackcve.app/badge/CVE-2026-99220.svg)](https://trackcve.app/cve/CVE-2026-99220)

Record last updated 3 Nov 2026, 19:12 UTC.