{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: tcp: Fix use-after-free of net in reqsk_timer_handler().\n\nsyzkaller reported a warning of netns tracker [0] followed by KASAN\nsplat [1] and another ref tracker warning [1].\n\nsyzkaller could not find a repro, but in the log, the only suspicious\nsequence was as follows:\n\n  18:26:22 executing program 1:\n  r0 = socket$inet6_mptcp(0xa, 0x1, 0x106)\n  ...\n  connect$inet6(r0, &(0x7f0000000080)={0xa, 0x4001, 0x0, @loopback}, 0x1c) (async)\n\nThe notable thing here is 0x4001 in connect(), which is RDS_TCP_PORT.\n\nSo, the scenario would be:\n\n  1. unshare(CLONE_NEWNET) creates a per netns tcp listener in\n      rds_tcp_listen_init().\n  2. syz-executor connect()s to it and creates a reqsk.\n  3. syz-executor exit()s immediately.\n  4. netns is dismantled.  [0]\n  5. reqsk timer is fired, and UAF happens while freeing reqsk.  [1]\n  6. listener is freed after RCU grace period.  [2]\n\nBasically, reqsk assumes that the listener guarantees netns safety\nuntil all reqsk timers are expired by holding the listener's refcount.\nHowever, this was not the case for kernel sockets.\n\nCommit 740ea3c4a0b2 (\"tcp: Clean up kernel listener's reqsk in\ninet_twsk_purge()\") fixed this issue only for per-netns ehash.\n\nLet's apply the same fix for the global ehash.\n\n[0]:\nref_tracker: net notrefcnt@0000000065449cc3 has 1/1 users at\n     sk_alloc (./include/net/net_namespace.h:337 net/core/sock.c:2146)\n     inet6_create (net/ipv6/af_inet6.c:192 net/ipv6/af_inet6.c:119)\n     __sock_create (net/socket.c:1572)\n     rds_tcp_listen_init (net/rds/tcp_listen.c:279)\n     rds_tcp_init_net (net/rds/tcp.c:577)\n     ops_init (net/core/net_namespace.c:137)\n     setup_net (net/core/net_namespace.c:340)\n     copy_net_ns (net/core/net_namespace.c:497)\n     create_new_namespaces (kernel/nsproxy.c:110)\n     unshare_nsproxy_namespaces (kernel/nsproxy.c:228 (discriminator 4))\n     ksys_unshare (kernel/fork.c:3429)\n     __x64_sys_unshare (kernel/fork.c:3496)\n     do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\n     entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)\n...\nWARNING: CPU: 0 PID: 27 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179)\n\n[1]:\nBUG: KASAN: slab-use-after-free in inet_csk_reqsk_queue_drop (./include/net/inet_hashtables.h:180 net/ipv4/inet_connection_sock.c:952 net/ipv4/inet_connection_sock.c:966)\nRead of size 8 at addr ffff88801b370400 by task swapper/0/0\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <IRQ>\n dump_stack_lvl (lib/dump_stack.c:107 (discriminator 1))\n print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n kasan_report (mm/kasan/report.c:603)\n inet_csk_reqsk_queue_drop (./include/net/inet_hashtables.h:180 net/ipv4/inet_connection_sock.c:952 net/ipv4/inet_connection_sock.c:966)\n reqsk_timer_handler (net/ipv4/inet_connection_sock.c:979 net/ipv4/inet_connection_sock.c:1092)\n call_timer_fn (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/timer.h:127 kernel/time/timer.c:1701)\n __run_timers.part.0 (kernel/time/timer.c:1752 kernel/time/timer.c:2038)\n run_timer_softirq (kernel/time/timer.c:2053)\n __do_softirq (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/irq.h:142 kernel/softirq.c:554)\n irq_exit_rcu (kernel/softirq.c:427 kernel/softirq.c:632 kernel/softirq.c:644)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1076 (discriminator 14))\n </IRQ>\n\nAllocated by task 258 on cpu 0 at 83.612050s:\n kasan_save_stack (mm/kasan/common.c:48)\n kasan_save_track (mm/kasan/common.c:68)\n __kasan_slab_alloc (mm/kasan/common.c:343)\n kmem_cache_alloc (mm/slub.c:3813 mm/slub.c:3860 mm/slub.c:3867)\n copy_net_ns (./include/linux/slab.h:701 net/core/net_namespace.c:421 net/core/net_namespace.c:480)\n create_new_namespaces (kernel/nsproxy.c:110)\n unshare_nsproxy_name\n---truncated---"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/ipv4/tcp_minisocks.c"
               ],
               "versions": [
                  {
                     "version": "467fa15356ac",
                     "lessThan": "9905a157048f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "467fa15356ac",
                     "lessThan": "f901ee07853c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "467fa15356ac",
                     "lessThan": "9ceac040506a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "467fa15356ac",
                     "lessThan": "1e9fd5cf8d7f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "467fa15356ac",
                     "lessThan": "2a750d6a5b36",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/ipv4/tcp_minisocks.c"
               ],
               "versions": [
                  {
                     "version": "4.3",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.3",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.83",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.23",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.11",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.2",
                     "lessThanOrEqual": "6.8.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/9905a157048f441f1412e7bd13372f4a971d75c6"
            },
            {
               "url": "https://git.kernel.org/stable/c/f901ee07853ce97e9f1104c7c898fbbe447f0279"
            },
            {
               "url": "https://git.kernel.org/stable/c/9ceac040506a05a30b104b2aa2e9146810704500"
            },
            {
               "url": "https://git.kernel.org/stable/c/1e9fd5cf8d7f487332560f7bb312fc7d416817f3"
            },
            {
               "url": "https://git.kernel.org/stable/c/2a750d6a5b365265dbda33330a6188547ddb5c24"
            }
         ],
         "title": "rds: tcp: Fix use-after-free of net in reqsk_timer_handler().",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26865",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}