af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg

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

Timeline

Scores

EPSS (exploitation in 30 days)

0.19% · top 92% of all CVEs (11 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.

Affected products

• Linux · Linux

  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < fca6072e1a7b1e709ada5604b951513b89b4bd0a
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < de6641d213373fbde9bbdd7c4b552254bc9f82fe
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 4d51845d734a4c5d079e56e0916f936a55e15055
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 9aa8773abfa0e954136875b4cbf2df4cf638e8a5
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8299e4d778f664b31b67cf4cf3d5409de2ecb92c
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0688d4e499bee3f2749bca27329bd128686230cb
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a4c88072abcaca593cefe70f90e9d3707526e8f9
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a52fa2addfcccc2c5a0217fd45562605088c018b
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 540bf24fba16b88c1b3b9353927204b4f1074e25

• Linux · Linux

  • affected 2.6.12
  • unaffected < 2.6.12
  • unaffected 4.19.316 – ≤ 4.19.*
  • unaffected 5.4.278 – ≤ 5.4.*
  • unaffected 5.10.219 – ≤ 5.10.*
  • unaffected 5.15.161 – ≤ 5.15.*
  • unaffected 6.1.93 – ≤ 6.1.*
  • unaffected 6.6.33 – ≤ 6.6.*
  • unaffected 6.8.12 – ≤ 6.8.*
  • unaffected 6.9.3 – ≤ 6.9.*
  • unaffected 6.10 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2024-37459 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-38596](https://cveledger.app/badge/CVE-2024-38596.svg)](https://cveledger.app/cve/CVE-2024-38596)

Record last updated 15 Oct 2026, 00:43 UTC.