# CVE-2026-99220: asymmetric_keys: reject trust keys without IDs

CVE-2026-99220 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99220, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99220
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 2, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99220

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-1 | [DEBIAN-CVE-2026-99220](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99220.md) | Nov 3, 2026 |
| Linux | linux Debian 14 | 7.2.14-1 | [DEBIAN-CVE-2026-99220](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99220.md) | Nov 3, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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