CVE-2023-52772 remediation guide

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: af_unix: fix use-after-free in unix_stream_read_actor() syzbot reported the following crash [1] After releasing unix socket lock, u->oob_skb can be changed by another thread. We must temporarily increase skb refcount to make sure this other thread will not free the skb under us. [1] BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 Read of size 4 at addr ffff88801f3b9cc4 by task syz-executor107/5297 CPU: 1 PID: 5297 Comm: syz-executor107 Not tainted 6.6.0-syzkaller-15910-gb8e3a87a62...

Open CVE record

ProductLinux Linux, linux kernel

Affected versions>= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 75bcfc188abf4fae9c1d5f5dc0a03540be602eef, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < d179189eec426fe4801e4b91efa1889faed12700, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < eae0b295ce16d8c8b4114c3037993191b4bb92f0, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 069a3ec329ff43e7869a3d94c62cd03203016bce, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 4b7b492615cf3017190f55444f7016812b66611d, >= 5.15, >= 5.15 < 5.15.140, >= 5.16 < 6.1.64, >= 6.2 < 6.5.13, >= 6.6 < 6.6.3

Fixed versions5.15.140, 6.1.64, 6.5.13, 6.6.3

Priority basisReview · CVSS 7.8 · EPSS 0.24%

Identify the affected asset

Confirm whether Linux Linux, linux kernel is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 75bcfc188abf4fae9c1d5f5dc0a03540be602eef, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < d179189eec426fe4801e4b91efa1889faed12700, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < eae0b295ce16d8c8b4114c3037993191b4bb92f0, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 069a3ec329ff43e7869a3d94c62cd03203016bce, >= 876c14ad014d0e39c57cbfde53e13d17cdb6d645 < 4b7b492615cf3017190f55444f7016812b66611d, >= 5.15, >= 5.15 < 5.15.140, >= 5.16 < 6.1.64, >= 6.2 < 6.5.13, >= 6.6 < 6.6.3. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 5.15.140, 6.1.64, 6.5.13, 6.6.3. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.