af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg
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
- Published
- Jun 19, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 8th percentile
- CWE
- CWE-362
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 18 / 40 · 4.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.13 and later · before 4.19.316
- linux linux kernel4.20 and later · before 5.4.278
- linux linux kernel5.5 and later · before 5.10.219
- linux linux kernel5.11 and later · before 5.15.161
- linux linux kernel5.16 and later · before 6.1.93
- linux linux kernel6.2 and later · before 6.6.33
- linux linux kernel6.7 and later · before 6.8.12
- linux linux kernel6.9 and later · before 6.9.3
- linux linux kernel2.6.12
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.12affected
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before fca6072e1a7b1e709ada5604b951513b89b4bd0aaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before de6641d213373fbde9bbdd7c4b552254bc9f82feaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4d51845d734a4c5d079e56e0916f936a55e15055affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9aa8773abfa0e954136875b4cbf2df4cf638e8a5affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8299e4d778f664b31b67cf4cf3d5409de2ecb92caffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0688d4e499bee3f2749bca27329bd128686230cbaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a4c88072abcaca593cefe70f90e9d3707526e8f9affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a52fa2addfcccc2c5a0217fd45562605088c018baffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 540bf24fba16b88c1b3b9353927204b4f1074e25affected · git
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.94-1 | 6.1.94-1 |
| Debian:13 | linux | before 6.8.12-1 | 6.8.12-1 |
| openSUSE:Leap 15.6 | dtb-aarch64 | before 6.4.0-150600.23.25.1 | 6.4.0-150600.23.25.1 |
| openSUSE:Leap 15.6 | kernel-debug | before 6.4.0-150600.23.25.1 | 6.4.0-150600.23.25.1 |
| openSUSE:Leap 15.6 | kernel-kvmsmall | before 6.4.0-150600.23.25.1 | 6.4.0-150600.23.25.1 |
| openSUSE:Leap 15.6 | kernel-obs-qa | before 6.4.0-150600.23.25.1 | 6.4.0-150600.23.25.1 |
| Red Hat:rhel_aus:8.6::baseos | bpftool | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | bpftool-debuginfo | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-abi-stablelists | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-core | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug-core | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug-debuginfo | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug-devel | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug-modules | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debug-modules-extra | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debuginfo | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-debuginfo-common-x86_64 | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-devel | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-doc | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-modules | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-modules-extra | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
| Red Hat:rhel_aus:8.6::baseos | kernel-tools | before 0:4.18.0-372.113.1.el8_6 | 0:4.18.0-372.113.1.el8_6 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0688d4e499bee3f2749bca27329bd128686230cb | Vendor (CNA) |
| Linux Linux | 4d51845d734a4c5d079e56e0916f936a55e15055 | Vendor (CNA) |
| Linux Linux | 540bf24fba16b88c1b3b9353927204b4f1074e25 | Vendor (CNA) |
| Linux Linux | 8299e4d778f664b31b67cf4cf3d5409de2ecb92c | Vendor (CNA) |
| Linux Linux | 9aa8773abfa0e954136875b4cbf2df4cf638e8a5 | Vendor (CNA) |
| Linux Linux | a4c88072abcaca593cefe70f90e9d3707526e8f9 | Vendor (CNA) |
| Linux Linux | a52fa2addfcccc2c5a0217fd45562605088c018b | Vendor (CNA) |
| Linux Linux | de6641d213373fbde9bbdd7c4b552254bc9f82fe | Vendor (CNA) |
| Linux Linux | fca6072e1a7b1e709ada5604b951513b89b4bd0a | Vendor (CNA) |
| debian:linux | 6.1.94-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-azure | 6.4.0-150600.8.14.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-source-azure | 6.4.0-150600.8.14.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-syms-azure | 6.4.0-150600.8.14.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:bpftool | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-abi-stablelists | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-core | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug-core | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules-extra | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:4.18.0-372.113.1.el8_6 · Red Hat:rhel_aus:8.6::baseos | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.25.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-azure | 6.4.0-150600.8.14.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.231.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.25.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.25.1.150600.12.10.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
+10
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/0688d4e499bee3f2749bca27329bd128686230cb
- git.kernel.org/stable/c/4d51845d734a4c5d079e56e0916f936a55e15055
- git.kernel.org/stable/c/540bf24fba16b88c1b3b9353927204b4f1074e25
- git.kernel.org/stable/c/8299e4d778f664b31b67cf4cf3d5409de2ecb92c
- git.kernel.org/stable/c/9aa8773abfa0e954136875b4cbf2df4cf638e8a5
- git.kernel.org/stable/c/a4c88072abcaca593cefe70f90e9d3707526e8f9
- git.kernel.org/stable/c/a52fa2addfcccc2c5a0217fd45562605088c018b
- git.kernel.org/stable/c/de6641d213373fbde9bbdd7c4b552254bc9f82fe
- git.kernel.org/stable/c/fca6072e1a7b1e709ada5604b951513b89b4bd0a
- lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- cert-portal.siemens.com/productcert/html/ssa-265688.html
- cert-portal.siemens.com/productcert/html/ssa-398330.html
- cert-portal.siemens.com/productcert/html/ssa-613116.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.