CVE-2024-38596: af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg
First published: Wed Jun 19 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.316 | 4.19.316 |
| redhat/kernel | <5.4.278 | 5.4.278 |
| redhat/kernel | <5.10.219 | 5.10.219 |
| redhat/kernel | <5.15.161 | 5.15.161 |
| redhat/kernel | <6.1.93 | 6.1.93 |
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.8.12 | 6.8.12 |
| redhat/kernel | <6.9.3 | 6.9.3 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.9-1 6.11.10-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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://launchpad.net/bugs/cve/CVE-2024-38596
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38596
- https://nvd.nist.gov/vuln/detail/CVE-2024-38596
- https://security-tracker.debian.org/tracker/CVE-2024-38596
- https://ubuntu.com/security/CVE-2024-38596
- https://git.kernel.org/linus/540bf24fba16b88c1b3b9353927204b4f1074e25
- https://access.redhat.com/security/cve/CVE-2024-38596
- https://lore.kernel.org/linux-cve-announce/2024061956-CVE-2024-38596-f660@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:4823
- https://access.redhat.com/errata/RHSA-2024:4831
- https://access.redhat.com/errata/RHSA-2024:4902
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:6206
- https://access.redhat.com/errata/RHSA-2024:9315
- https://access.redhat.com/errata/RHSA-2024:9546
- https://bugzilla.redhat.com/show_bug.cgi?id=2293371
- agent/title
- agent/weakness
- agent/type
- collector/nvd-api
- source/NVD
- agent/severity
- collector/launchpad-cve
- source/Launchpad
- collector/nvd-cve
- agent/remedy
- agent/author
- agent/first-publish-date
- agent/description
- agent/event
- collector/mitre-cve
- source/MITRE
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2024-38596
- agent/software-canonical-lookup
- agent/last-modified-date
- agent/references
- agent/tags
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- package-manager/debian