CVE-2024-38596af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg
Updated under an hour ago ()
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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
- CVSS
- 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fca6072e1a7b1e709ada5604b951513b89b4bd0a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before de6641d213373fbde9bbdd7c4b552254bc9f82fe; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4d51845d734a4c5d079e56e0916f936a55e15055; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9aa8773abfa0e954136875b4cbf2df4cf638e8a5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8299e4d778f664b31b67cf4cf3d5409de2ecb92c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0688d4e499bee3f2749bca27329bd128686230cb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a4c88072abcaca593cefe70f90e9d3707526e8f9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a52fa2addfcccc2c5a0217fd45562605088c018b; and 1 more ranges | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.1 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.1 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.13 before 4.19.316; from 4.20 before 5.4.278; from 5.5 before 5.10.219; from 5.11 before 5.15.161; from 5.16 before 6.1.93; from 6.2 before 6.6.33; from 6.7 before 6.8.12; from 6.9 before 6.9.3; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/fca6072e1a7b1e709ada5604b951513b89b4bd0apatch
- https://git.kernel.org/stable/c/de6641d213373fbde9bbdd7c4b552254bc9f82fepatch
- https://git.kernel.org/stable/c/4d51845d734a4c5d079e56e0916f936a55e15055patch
- https://git.kernel.org/stable/c/9aa8773abfa0e954136875b4cbf2df4cf638e8a5patch
- https://git.kernel.org/stable/c/8299e4d778f664b31b67cf4cf3d5409de2ecb92cpatch
- https://git.kernel.org/stable/c/0688d4e499bee3f2749bca27329bd128686230cbpatch
- https://git.kernel.org/stable/c/a4c88072abcaca593cefe70f90e9d3707526e8f9patch
- https://git.kernel.org/stable/c/a52fa2addfcccc2c5a0217fd45562605088c018bpatch
- https://git.kernel.org/stable/c/540bf24fba16b88c1b3b9353927204b4f1074e25patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.