In the Linux kernel, the following vulnerability has been resolved:
af_unix: Fix data-races around user->unix_inflight.
user->unix_inflight is changed under spin_lock(unix_gc_lock), but too_many_unix_fds() reads it locklessly.
Let's annotate the write/read accesses to user->unix_inflight.
BUG: KCSAN: data-race in unix_attach_fds / unix_inflight
write to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1: unix_inflight+0x157/0x180 net/unix/scm.c:66 unix_attach_fds+0x147/0x1e0 net/unix/scm.c:123 unix_scm_to_skb net/unix/af_unix.c:1827 [inline] unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950 unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline] unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0x148/0x160 net/socket.c:748 ____sys_sendmsg+0x4e4/0x610 net/socket.c:2494 ___sys_sendmsg+0xc6/0x140 net/socket.c:2548 __sys_sendmsg+0x94/0x140 net/socket.c:2577 __do_sys_sendmsg net/socket.c:2586 [inline] __se_sys_sendmsg net/socket.c:2584 [inline] __x64_sys_sendmsg+0x45/0x50 net/socket.c:2584 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
read to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0: too_many_unix_fds net/unix/scm.c:101 [inline] unix_attach_fds+0x54/0x1e0 net/unix/scm.c:110 unix_scm_to_skb net/unix/af_unix.c:1827 [inline] unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950 unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline] unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0x148/0x160 net/socket.c:748 ____sys_sendmsg+0x4e4/0x610 net/socket.c:2494 ___sys_sendmsg+0xc6/0x140 net/socket.c:2548 __sys_sendmsg+0x94/0x140 net/socket.c:2577 __do_sys_sendmsg net/socket.c:2586 [inline] __se_sys_sendmsg net/socket.c:2584 [inline] __x64_sys_sendmsg+0x45/0x50 net/socket.c:2584 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
value changed: 0x000000000000000c -> 0x000000000000000d
Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 44814 Comm: systemd-coredum Not tainted 6.4.0-11989-g6843306689af #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
CVSS Details
- CVSS 3.1 Base Score: 4.7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade perf-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-livepatch-4.14.326-245.539Upgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-toolsUpgrade kernel-tools-develUpgrade kernel-livepatch-5.15.133-86.144Upgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-livepatch-5.10.196-185.743Upgrade kernel | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.1.55-75.123Upgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade perf-debuginfoUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade python3-perfUpgrade bpftool-debuginfoUpgrade kernel-libbpf-staticUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-develUpgrade kernelUpgrade bpftoolUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-headers | Sep 30, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perf | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade python3-perf | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Nov 14, 2025 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-aws-5.4Upgrade linux-ibm-5.15Upgrade linux-ibm-5.4Upgrade linux-lowlatencyUpgrade linux-raspi-5.4Upgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-fipsUpgrade linux-realtimeUpgrade linux-gkeUpgrade linux-bluefieldUpgrade linux-aws-5.15Upgrade linux-awsUpgrade linux-oracle-5.15Upgrade linux-nvidia-tegraUpgrade linux-nvidia-tegra-5.15Upgrade linux-raspiUpgrade linux-oracle-5.4Upgrade linux-intel-iotgUpgrade linux-gcp-5.4Upgrade linux-gcpUpgrade linux-aws-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-azure-fipsUpgrade linux-hwe-5.4Upgrade linux-azure-5.4Upgrade linux-oracleUpgrade linux-azureUpgrade linux-hwe-5.15Upgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-gkeopUpgrade linux-iotUpgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-nvidia-tegra-igxUpgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-fips | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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