{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "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 <f3> 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 <NMI>\n </NMI>\n <TASK>\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 </TASK>"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/unix/garbage.c"
               ],
               "versions": [
                  {
                     "version": "36f7371de977",
                     "lessThan": "6c480d0f1318",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "2a3d40b4025f",
                     "lessThan": "c4c795b21dd2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69e0f04460f4",
                     "lessThan": "e9eac260369d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "cb8890318dde",
                     "lessThan": "43ba9e331559",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "25236c91b5ab",
                     "lessThan": "aa82ac51d633",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/unix/garbage.c"
               ],
               "versions": [
                  {
                     "version": "5.15.149",
                     "lessThan": "5.15.151",
                     "status": "affected",
                     "versionType": "custom"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6"
            },
            {
               "url": "https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60"
            },
            {
               "url": "https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d"
            },
            {
               "url": "https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787"
            },
            {
               "url": "https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3"
            }
         ],
         "title": "af_unix: Drop oob_skb ref before purging queue in GC.",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26750",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}