{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-39500", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-25T14:23:23.751Z", "datePublished": "2024-07-12T12:20:34.317Z", "dateUpdated": "2026-08-05T11:33:47.078Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:47.078Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsock_map: avoid race between sock_map_close and sk_psock_put\n\nsk_psock_get will return NULL if the refcount of psock has gone to 0, which\nwill happen when the last call of sk_psock_put is done. However,\nsk_psock_drop may not have finished yet, so the close callback will still\npoint to sock_map_close despite psock being NULL.\n\nThis can be reproduced with a thread deleting an element from the sock map,\nwhile the second one creates a socket, adds it to the map and closes it.\n\nThat will trigger the WARN_ON_ONCE:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 7220 at net/core/sock_map.c:1701 sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701\nModules linked in:\nCPU: 1 PID: 7220 Comm: syz-executor380 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024\nRIP: 0010:sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701\nCode: df e8 92 29 88 f8 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 79 29 88 f8 4c 8b 23 eb 89 e8 4f 15 23 f8 90 <0f> 0b 90 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 13 26 3d 02\nRSP: 0018:ffffc9000441fda8 EFLAGS: 00010293\nRAX: ffffffff89731ae1 RBX: ffffffff94b87540 RCX: ffff888029470000\nRDX: 0000000000000000 RSI: ffffffff8bcab5c0 RDI: ffffffff8c1faba0\nRBP: 0000000000000000 R08: ffffffff92f9b61f R09: 1ffffffff25f36c3\nR10: dffffc0000000000 R11: fffffbfff25f36c4 R12: ffffffff89731840\nR13: ffff88804b587000 R14: ffff88804b587000 R15: ffffffff89731870\nFS: 000055555e080380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000000 CR3: 00000000207d4000 CR4: 0000000000350ef0\nCall Trace:\n \n unix_release+0x87/0xc0 net/unix/af_unix.c:1048\n __sock_release net/socket.c:659 [inline]\n sock_close+0xbe/0x240 net/socket.c:1421\n __fput+0x42b/0x8a0 fs/file_table.c:422\n __do_sys_close fs/open.c:1556 [inline]\n __se_sys_close fs/open.c:1541 [inline]\n __x64_sys_close+0x7f/0x110 fs/open.c:1541\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fb37d618070\nCode: 00 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d4 e8 10 2c 00 00 80 3d 31 f0 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c\nRSP: 002b:00007ffcd4a525d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003\nRAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fb37d618070\nRDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000004\nRBP: 0000000000000000 R08: 0000000100000000 R09: 0000000100000000\nR10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n \n\nUse sk_psock, which will only check that the pointer is not been set to\nNULL yet, which should only happen after the callbacks are restored. If,\nthen, a reference can still be gotten, we may call sk_psock_stop and cancel\npsock->work.\n\nAs suggested by Paolo Abeni, reorder the condition so the control flow is\nless convoluted.\n\nAfter that change, the reproducer does not trigger the WARN_ON_ONCE\nanymore." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The race is driven entirely by local syscalls — `bpf(BPF_MAP_DELETE_ELEM)` on a sockmap in one thread against `socket()`/map-update/`close()` in another. No network packet is needed to trigger the flaw itself, so this is local attack vector.\nAC:L - The attacker controls both sides of the race and can spin both threads in a tight loop indefinitely; syzbot produced a reliable C reproducer that trips the condition. No memory layout or victim state outside the attacker's influence is required.\nPR:L - A local unprivileged account suffices to drive the close() side, and sockmap access is routinely delegated to non-root workloads via BPF tokens and sockops-based service meshes; this matches the CNA's established PR:L scoring for the same sock_map/sk_psock code (CVE-2025-38154, CVE-2026-43016).\nUI:N - The attacker's own threads perform every step — map creation, element deletion, socket creation and close. No action by any other user is needed.\nS:U - The corruption and its consequences are confined to the kernel's own socket and slab objects within a single security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - For TCP sockets the missed `saved_close()` skips `sock_orphan()`, leaving `sk->sk_socket` and `sk->sk_wq` dangling into the freed `socket_alloc` slab object while the sk remains hashed and packet-reachable, giving a use-after-free read the attacker can reclaim and use to disclose kernel memory.\nI:H - The same dangling `sk_wq` is walked by `wake_up_interruptible_sync_poll()` and `sock_wake_async()`, which traverse a freed waitqueue list and invoke `wait_queue_entry->func`; heap-spraying the reclaimed slot yields a write/control-flow-hijack primitive.\nA:H - The `WARN_ON_ONCE` splat panics outright on the widely used `panic_on_warn=1` configurations, each race win permanently leaks a `struct sock` for unbounded memory exhaustion, and the use-after-free crashes the kernel even when not weaponized (unguarded kernels hit stack-overflow recursion instead)." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/sock_map.c" ], "versions": [ { "version": "aadb2bb83ff789de63b48b4edeab7329423a50d3", "lessThan": "4959ffc65a0e94f8acaac20deac49f89e6ded52d", "status": "affected", "versionType": "git" }, { "version": "aadb2bb83ff789de63b48b4edeab7329423a50d3", "lessThan": "5eabdf17fed2ad41b836bb4055ec36d95e512c50", "status": "affected", "versionType": "git" }, { "version": "aadb2bb83ff789de63b48b4edeab7329423a50d3", "lessThan": "e946428439a0d2079959f5603256ac51b6047017", "status": "affected", "versionType": "git" }, { "version": "aadb2bb83ff789de63b48b4edeab7329423a50d3", "lessThan": "3627605de498639a3c586c8684d12c89cba11073", "status": "affected", "versionType": "git" }, { "version": "aadb2bb83ff789de63b48b4edeab7329423a50d3", "lessThan": "4b4647add7d3c8530493f7247d11e257ee425bf0", "status": "affected", "versionType": "git" }, { "version": "c4896f5fd83664a50ac4fef4131a265d15734e5a", "status": "affected", "versionType": "git" }, { "version": "5.10.248", "lessThan": "5.11", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/sock_map.c" ], "versions": [ { "version": "5.13", "status": "affected" }, { "version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.95", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.35", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.6", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.15.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.9.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.248" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4959ffc65a0e94f8acaac20deac49f89e6ded52d" }, { "url": "https://git.kernel.org/stable/c/5eabdf17fed2ad41b836bb4055ec36d95e512c50" }, { "url": "https://git.kernel.org/stable/c/e946428439a0d2079959f5603256ac51b6047017" }, { "url": "https://git.kernel.org/stable/c/3627605de498639a3c586c8684d12c89cba11073" }, { "url": "https://git.kernel.org/stable/c/4b4647add7d3c8530493f7247d11e257ee425bf0" } ], "title": "sock_map: avoid race between sock_map_close and sk_psock_put", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/4959ffc65a0e94f8acaac20deac49f89e6ded52d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/5eabdf17fed2ad41b836bb4055ec36d95e512c50", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e946428439a0d2079959f5603256ac51b6047017", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3627605de498639a3c586c8684d12c89cba11073", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/4b4647add7d3c8530493f7247d11e257ee425bf0", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T21:56:18.691Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-39500", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:07:13.633349Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:40.574Z" } } ] } }