In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: fix race in sock_map_free()
sock_map_free() calls release_sock(sk) without owning a reference on the socket. This can cause use-after-free as syzbot found [1]
Jakub Sitnicki already took care of a similar issue in sock_hash_free() in commit 75e68e5bf2c7 ("bpf, sockhash: Synchronize delete from bucket list on map free")
[1] refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Code: 68 8b 31 c0 e8 75 71 15 fd 0f 0b e9 64 ff ff ff e8 d9 6e 4e fd c6 05 62 9c 3d 0a 01 48 c7 c7 80 bb 68 8b 31 c0 e8 54 71 15 fd <0f> 0b e9 43 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a2 fe ff RSP: 0018:ffffc9000456fb60 EFLAGS: 00010246 RAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5 R10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004 R13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c30000 CR3: 000000000d08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __refcount_dec include/linux/refcount.h:344 [inline] refcount_dec include/linux/refcount.h:359 [inline] __sock_put include/net/sock.h:779 [inline] tcp_release_cb+0x2d0/0x360 net/ipv4/tcp_output.c:1092 release_sock+0xaf/0x1c0 net/core/sock.c:3468 sock_map_free+0x219/0x2c0 net/core/sock_map.c:356 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK>
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernelUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.86-53.137Upgrade kernel-livepatch-5.10.165-143.735Upgrade bpftool-debuginfoUpgrade perfUpgrade bpftoolUpgrade kernel-develUpgrade python-perfUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-aws-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-fipsUpgrade linux-raspi-5.4Upgrade linux-azure-fdeUpgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.4Upgrade linux-awsUpgrade linux-gcpUpgrade linux-bluefieldUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-riscv-5.15Upgrade linux-azureUpgrade linux-oracle-5.15Upgrade linux-hwe-5.15Upgrade linux-gkeopUpgrade linux-azure-5.4Upgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-realtimeUpgrade linux-kvmUpgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-xilinx-zynqmpUpgrade linux-azure-5.15Upgrade linux-iotUpgrade linux-hwe-5.4Upgrade linux-intel-iotgUpgrade linux-gcp-fipsUpgrade linux-nvidiaUpgrade linux-aws-fipsUpgrade linux-intel-iotg-5.15 | 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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