CVE-2024-38596
Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg A data-race condition has been identified in af_unix. In one data path, the write function unix_release_sock() atomically writes to sk->sk_shutdown using WRITE_ONCE. However, on the reader side, unix_stream_sendmsg() does not read it atomically. Consequently, this issue is causing the following KCSAN splat to occur: BUG: KCSAN: data-race in unix_release_sock / unix_stream_sendmsg write (marked) to 0xffff88867256ddbb of 1 bytes by task 7270 on cpu 28: unix_release_sock (net/unix/af_unix.c:640) unix_release (net/unix/af_unix.c:1050) sock_close (net/socket.c:659 net/socket.c:1421) __fput (fs/file_table.c:422) __fput_sync (fs/file_table.c:508) __se_sys_close (fs/open.c:1559 fs/open.c:1541) __x64_sys_close (fs/open.c:1541) x64_sys_call (arch/x86/entry/syscall_64.c:33) do_syscall_64 (arch/x86/entry/common.c:?) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) read to 0xffff88867256ddbb of 1 bytes by task 989 on cpu 14: unix_stream_sendmsg (net/unix/af_unix.c:2273) __sock_sendmsg (net/socket.c:730 net/socket.c:745) ____sys_sendmsg (net/socket.c:2584) __sys_sendmmsg (net/socket.c:2638 net/socket.c:2724) __x64_sys_sendmmsg (net/socket.c:2753 net/socket.c:2750 net/socket.c:2750) x64_sys_call (arch/x86/entry/syscall_64.c:33) do_syscall_64 (arch/x86/entry/common.c:?) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) value changed: 0x01 -> 0x03 The line numbers are related to commit dd5a440a31fa ("Linux 6.9-rc7"). Commit e1d09c2c2f57 ("af_unix: Fix data races around sk->sk_shutdown.") addressed a comparable issue in the past regarding sk->sk_shutdown. However, it overlooked resolving this particular data path. This patch only offending unix_stream_sendmsg() function, since the other reads seem to be protected by unix_state_lock() as discussed in
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Linux kernel Affected 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 2.6.12 | Affected | — |
| — | Affected | 4.19.316 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
AlmaLinux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | kernel-doc-4.18.0-553.16.1.el8_10.noarch.rpm |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.8.12-1 |
| sid | Fixed | 6.8.12-1 |
| forky | Fixed | 6.8.12-1 |
| bullseye | Fixed | 5.10.221-1 |
| bookworm | Fixed | 6.1.94-1 |
Red Hat Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | — |
| 8 | Fixed | — |
Rocky Linux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
References
- https://access.redhat.com/errata/RHSA-2024:9315
- https://git.kernel.org/stable/c/0688d4e499bee3f2749bca27329bd128686230cb
- https://git.kernel.org/stable/c/4d51845d734a4c5d079e56e0916f936a55e15055
- https://git.kernel.org/stable/c/540bf24fba16b88c1b3b9353927204b4f1074e25
- https://git.kernel.org/stable/c/8299e4d778f664b31b67cf4cf3d5409de2ecb92c
- https://git.kernel.org/stable/c/9aa8773abfa0e954136875b4cbf2df4cf638e8a5
- https://git.kernel.org/stable/c/a4c88072abcaca593cefe70f90e9d3707526e8f9
- https://git.kernel.org/stable/c/a52fa2addfcccc2c5a0217fd45562605088c018b
- https://git.kernel.org/stable/c/de6641d213373fbde9bbdd7c4b552254bc9f82fe
- https://git.kernel.org/stable/c/fca6072e1a7b1e709ada5604b951513b89b4bd0a
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
- https://errata.rockylinux.org/RXSA-2024:5101
- https://errata.rockylinux.org/RLSA-2024:5102
- https://errata.rockylinux.org/RLSA-2024:5101
- https://www.suse.com/security/cve/CVE-2024-38596.html
- https://security-tracker.debian.org/tracker/CVE-2024-38596
- https://access.redhat.com/errata/RHSA-2024:5101
- https://bugzilla.redhat.com/2263879
- https://bugzilla.redhat.com/2265645
- https://bugzilla.redhat.com/2265650
- https://bugzilla.redhat.com/2265797
- https://bugzilla.redhat.com/2266341
CWEs
CWE-362
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.