Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Affected versions

Linux: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before e4c1ec11132ec466f7362a95f36a506ce4dc08c9 (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 7c4491b5644e3a3708f3dbd7591be0a570135b84 (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 9aee87da5572b3a14075f501752e209801160d3d (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 45bcf60fe49b37daab1acee57b27211ad1574042 (git); 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 through before 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 (git); 2.6.38; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.