{"id":"CVE-2022-50259","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix race in sock_map_free()\n\nsock_map_free() calls release_sock(sk) without owning a reference\non the socket","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix race in sock_map_free()\n\nsock_map_free() calls release_sock(sk) without owning a reference\non the socket. This can cause use-after-free as syzbot foun…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362","CWE-911"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.4.14, < 5.4.229","linux_kernel >= 5.5.1, < 5.10.163","linux_kernel >= 5.11, < 5.15.86","linux_kernel >= 5.16, < 6.0.16","linux_kernel >= 6.1, < 6.1.2","linux_kernel = 5.5"],"patched":["linux_kernel 6.1.2"],"published":"2025-09-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:29.527","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-50259","references":[{"url":"https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50259.json"},{"url":"https://access.redhat.com/security/cve/CVE-2022-50259"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2395227"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-50259"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50259"},{"url":"https://lore.kernel.org/linux-cve-announce/2025091551-CVE-2022-50259-6276@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00118,"epssPercentile":0.01719,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:30:46.333972Z"},"scores":{"nvd":7.8,"vendor":4.1,"cna":7.8},"ingestedAt":"2026-10-15T21:45:11.284Z","slug":"CVE-2022-50259","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix race in sock_map_free()\n\nsock_map_free() calls release_sock(sk) without owning a reference\non the socket. This can cause use-after-free as syzbot found [1]\n\nJakub Sitnicki already took care of a similar issue\nin sock_hash_free() in commit 75e68e5bf2c7 (\"bpf, sockhash:\nSynchronize delete from bucket list on map free\")\n\n[1]\nrefcount_t: decrement hit 0; leaking memory.\nWARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31\nModules linked in:\nCPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nWorkqueue: events_unbound bpf_map_free_deferred\nRIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31\nCode: 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\nRSP: 0018:ffffc9000456fb60 EFLAGS: 00010246\nRAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0\nRDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000\nRBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5\nR10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004\nR13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf\nFS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30c30000 CR3: 000000000d08e000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n<TASK>\n__refcount_dec include/linux/refcount.h:344 [inline]\nrefcount_dec include/linux/refcount.h:359 [inline]\n__sock_put include/net/sock.h:779 [inline]\ntcp_release_cb+0x2d0/0x360 net/ipv4/tcp_output.c:1092\nrelease_sock+0xaf/0x1c0 net/core/sock.c:3468\nsock_map_free+0x219/0x2c0 net/core/sock_map.c:356\nprocess_one_work+0x81c/0xd10 kernel/workqueue.c:2289\nworker_thread+0xb14/0x1330 kernel/workqueue.c:2436\nkthread+0x266/0x300 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n</TASK>\n\n## Affected\n\n- `linux_kernel >= 5.4.14, < 5.4.229`\n- `linux_kernel >= 5.5.1, < 5.10.163`\n- `linux_kernel >= 5.11, < 5.15.86`\n- `linux_kernel >= 5.16, < 6.0.16`\n- `linux_kernel >= 6.1, < 6.1.2`\n- `linux_kernel = 5.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.1.2`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50259.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":230067,"id":"CVE-2022-50259","ts":1793124778934,"field":"cvss","old":"4.1","new":"7.8"},{"seq":230066,"id":"CVE-2022-50259","ts":1793124778934,"field":"severity","old":"medium","new":"high"},{"seq":223769,"id":"CVE-2022-50259","ts":1792238396531,"field":"cvss","old":"7.8","new":"4.1"},{"seq":223768,"id":"CVE-2022-50259","ts":1792238396531,"field":"severity","old":"high","new":"medium"}]}