{"id":"CVE-2024-26750","summary":"af_unix: Drop oob_skb ref before purging queue in GC.","details":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Drop oob_skb ref before purging queue in GC.\n\nsyzbot reported another task hung in __unix_gc().  [0]\n\nThe current while loop assumes that all of the left candidates\nhave oob_skb and calling kfree_skb(oob_skb) releases the remaining\ncandidates.\n\nHowever, I missed a case that oob_skb has self-referencing fd and\nanother fd and the latter sk is placed before the former in the\ncandidate list.  Then, the while loop never proceeds, resulting\nthe task hung.\n\n__unix_gc() has the same loop just before purging the collected skb,\nso we can call kfree_skb(oob_skb) there and let __skb_queue_purge()\nrelease all inflight sockets.\n\n[0]:\nSending NMI from CPU 0 to CPUs 1:\nNMI backtrace for cpu 1\nCPU: 1 PID: 2784 Comm: kworker/u4:8 Not tainted 6.8.0-rc4-syzkaller-01028-g71b605d32017 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nWorkqueue: events_unbound __unix_gc\nRIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200\nCode: 89 fb e8 23 00 00 00 48 8b 3d 84 f5 1a 0c 48 89 de 5b e9 43 26 57 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 \u003cf3\u003e 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 52 70 7e 65 8b 15 91 52 70\nRSP: 0018:ffffc9000a17fa78 EFLAGS: 00000287\nRAX: ffffffff8a0a6108 RBX: ffff88802b6c2640 RCX: ffff88802c0b3b80\nRDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000\nRBP: ffffc9000a17fbf0 R08: ffffffff89383f1d R09: 1ffff1100ee5ff84\nR10: dffffc0000000000 R11: ffffed100ee5ff85 R12: 1ffff110056d84ee\nR13: ffffc9000a17fae0 R14: 0000000000000000 R15: ffffffff8f47b840\nFS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffef5687ff8 CR3: 0000000029b34000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cNMI\u003e\n \u003c/NMI\u003e\n \u003cTASK\u003e\n __unix_gc+0xe69/0xf40 net/unix/garbage.c:343\n process_one_work kernel/workqueue.c:2633 [inline]\n process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706\n worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787\n kthread+0x2ef/0x390 kernel/kthread.c:388\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242\n \u003c/TASK\u003e","modified":"2026-03-20T12:35:11.628166Z","published":"2024-04-04T08:20:14.494Z","related":["SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26750.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26750.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26750"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"36f7371de977f805750748e80279be7e370df85c"},{"fixed":"6c480d0f131862645d172ca9e25dc152b1a5c3a6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2a3d40b4025fcfe51b04924979f1653993b17669"},{"fixed":"c4c795b21dd23d9514ae1c6646c3fb2c78b5be60"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"69e0f04460f4037e01e29f0d9675544f62aafca3"},{"fixed":"e9eac260369d0cf57ea53df95427125725507a0d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cb8890318dde26fc89c6ea67d6e9070ab50b6e91"},{"fixed":"43ba9e331559a30000c862eea313248707afa787"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"25236c91b5ab4a26a56ba2e79b8060cf4e047839"},{"fixed":"aa82ac51d63328714645c827775d64dbfd9941f3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26750.json"}}],"schema_version":"1.7.5"}