keys: Protect the read method check against type removal
Summary
| CVE | CVE-2026-99222 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-02 16:17:46 UTC |
| Updated | 2026-11-03 20:18:27 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: keys: Protect the read method check against type removal keyctl_read_key() checks key->type->read without holding key->sem. A reference keeps the key alive, but does not pin the module containing its type. A surviving RxRPC key can therefore be read while AF_RXRPC is being unloaded: KEYCTL_READ task Module unload and key GC ---------------- ------------------------ lookup_user_key() permission / possession checks load key->type af_rxrpc_exit() unregister_key_type() GC: down_write(key->sem) GC: retype to key_type_dead GC: up_write(key->sem) unregister_key_type() returns free_module() read saved type's read member The final access can read freed module storage. The read invocation in __keyctl_read_key() is already protected by key->sem, but the earlier method check is outside that critical section. Move the method check into __keyctl_read_key(), after key_validate() and under its existing read hold on key->sem. The check and invocation then use the same protected type for length queries and every read retry. The GC cannot retype the key until the semaphore is released, and type unregistration waits for that GC pass before the module can be freed. Return -EOPNOTSUPP when validation succeeds and the type has no read method. A temporary buffer may now be allocated before this result; allocation and copying to userspace remain outside the semaphore. |
Risk And Classification
EPSS: 0.001650000 probability, percentile 0.057360000 (date 2026-11-03)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 e5f830ae6611cddbfc504c43f14155f60b63206a git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 ff11cfed85cbfdd7fe1185ebd18d2c7a8353ad8d git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 1486caee47b4909f52835a957c3293e970113e44 git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 ff44f1b303aa76a818d898e85c56ed4852c031e2 git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 6a36e2a1a017c51f8a8ad2a094566bad97c46a9b git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 3edc064069d07e7d37359fcb4d03d3bab15ee3ab git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 cf1af7df80e38bf58bd74c2cccce32fcbd1a596a git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 e2a2deda08d91644f5e30c17d267b1cdc5f124b2 git | Not specified |
| CNA | Linux | Linux | affected d3ec10aa95819bff18a0d936b18884c7816d0914 925c84e3cc21caf09de92d9bcafab0147790debf git | Not specified |
| CNA | Linux | Linux | affected 7fa67aa30509ad0da72ac0f757aa76e53c0ea3de git | Not specified |
| CNA | Linux | Linux | affected 18779eac17b5df9dff57138d07631573553a41d4 git | Not specified |
| CNA | Linux | Linux | affected f1afcf9488fc45765e20e2047d3b776981900e0b git | Not specified |
| CNA | Linux | Linux | affected 212d3adb1af4e34acb158d6c6def370016a1011d git | Not specified |
| CNA | Linux | Linux | affected 4.14.177 4.15 semver | Not specified |
| CNA | Linux | Linux | affected 4.19.118 4.20 semver | Not specified |
| CNA | Linux | Linux | affected 5.4.35 5.5 semver | Not specified |
| CNA | Linux | Linux | affected 5.6.7 5.7 semver | Not specified |
| CNA | Linux | Linux | affected 5.7 | Not specified |
| CNA | Linux | Linux | unaffected 5.7 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.273 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.224 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.191 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.161 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.115 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.60 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.14 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3.1 7.3.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.4-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/e5f830ae6611cddbfc504c43f14155f60b63206a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6a36e2a1a017c51f8a8ad2a094566bad97c46a9b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ff11cfed85cbfdd7fe1185ebd18d2c7a8353ad8d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e2a2deda08d91644f5e30c17d267b1cdc5f124b2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3edc064069d07e7d37359fcb4d03d3bab15ee3ab | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/925c84e3cc21caf09de92d9bcafab0147790debf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ff44f1b303aa76a818d898e85c56ed4852c031e2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1486caee47b4909f52835a957c3293e970113e44 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cf1af7df80e38bf58bd74c2cccce32fcbd1a596a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.