keys: Check the authorization payload in process keyring searches
Summary
| CVE | CVE-2026-99225 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-02 16:17:47 UTC |
| Updated | 2026-11-03 20:18:28 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: keys: Check the authorization payload in process keyring searches An authorization payload and its saved credentials must remain valid while search_process_keyrings_rcu() searches the requestor's keyrings. The function validates the authorization key, then separately loads payload.data[0] and unconditionally reads rka->cred. Validation does not prevent request_key_auth_revoke() from clearing the payload. A request-key helper can assume authority and fork a descendant that inherits the authorization key. If the descendant misses in its own keyrings, it falls back to the saved requestor credentials. Successful target instantiation invalidates the authorization key without clearing the payload. After the helper exits, UMH_WAIT_PROC returns to the requester, which calls complete_request_key() and revokes that key. With the descendant paused after validation, the paths can interleave as follows: 1. The descendant enters search_process_keyrings_rcu() under RCU and key_validate() succeeds. 2. The helper instantiates the target, invalidates the authorization key, and exits. 3. The requester resumes from UMH_WAIT_PROC, calls complete_request_key(), and revokes the authorization key. request_key_auth_revoke() sets its payload pointer to NULL. 4. The descendant loads NULL and dereferences rka->cred. This NULL dereference can oops the kernel. RCU delays payload disposal but does not prevent the pointer from being cleared. Load the payload with dereference_key_rcu() and require a non-NULL result before validating the authorization key and searching its saved credentials. A non-NULL payload and its credentials remain alive for the caller's RCU read-side section; a cleared payload skips the fallback search and follows the existing error selection. KASAN report as below: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] RIP: 0010:search_process_keyrings_rcu+0x32b/0x790 |
Risk And Classification
EPSS: 0.001650000 probability, percentile 0.057350000 (date 2026-11-03)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 14fb6fad526b35a7ebd121f1dd313abe652e0aa6 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 7d3d2fffe933e538472ccafe5bbc7109488b9ce3 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 26949c2e4c461e9e620e935bc22717f36a40b615 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 984a178d54515779a1bee100b92a6cee8777c830 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 b86db7993051d05810601654e886a1e78e1fa495 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 b4dfda438fee3c6faa15d9b421c373de6a0e476f git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 49f4e768540d25d8852ef750313afda6a4774871 git | Not specified |
| CNA | Linux | Linux | affected e59428f721ee096d8a020504ea908a6f0d952735 0a0ec45bf577a9b4d4960567f20d3877ef480de9 git | Not specified |
| CNA | Linux | Linux | affected 5.3 | Not specified |
| CNA | Linux | Linux | unaffected 5.3 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/26949c2e4c461e9e620e935bc22717f36a40b615 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/49f4e768540d25d8852ef750313afda6a4774871 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b4dfda438fee3c6faa15d9b421c373de6a0e476f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b86db7993051d05810601654e886a1e78e1fa495 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7d3d2fffe933e538472ccafe5bbc7109488b9ce3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/984a178d54515779a1bee100b92a6cee8777c830 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0a0ec45bf577a9b4d4960567f20d3877ef480de9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/14fb6fad526b35a7ebd121f1dd313abe652e0aa6 | 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.