CVE-2022-50259bpf, sockmap: fix race in sock_map_free()
Updated under an hour ago ()
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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>
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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) | 20ae0cb8983b05136d5293c47fadc99a8ca8ca2d builds before 4cabc3af4a6f36c222fecb15858c1060e59218e7; from 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b before be719496ae6a7fc325e9e5056a52f63ebc84cc0c; from 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b before a443c55d96dede82a724df6e70a318ad15c199e1; from 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b before e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62; 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b builds before 5c3568166129bc73fd6b37748d2d8f95cd8f22f3; 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b builds before 0a182f8d607464911756b4dbef5d6cad8de22469; from 5.4.14 before 5.4.229 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.4.14 before 5.4.229; from 5.5.1 before 5.10.163; from 5.11 before 5.15.86; from 5.16 before 6.0.16; from 6.1 before 6.1.2; 5.5; 5.5 | NVD |
References
- https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7patch
- https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0cpatch
- https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1patch
- https://git.kernel.org/stable/c/e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62patch
- https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3patch
- https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469patch
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.