CVE-2025-39931
Published: October 7, 2025Last modified: October 7, 2025
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.155-r0) |
| 25 LTS | linux-lts | Fixed (6.12.51-r0) | |
| Stream | linux-lts | Fixed (6.12.51-r0) |
References
- https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753
- https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71
- https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7
- https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a
- https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f