UBUNTU-CVE-2026-99220

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UBUNTU-CVE-2026-99220

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-99220, https://www.cve.org/CVERecord?id=CVE-2026-99220, https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935, https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b, https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128, https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651, https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752, https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818