CVE-2022-50259 (GCVE-0-2022-50259)
Vulnerability from cvelistv5
Published
2025-09-15 14:02
Modified
2026-10-15 21:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix race in sock_map_free() sock_map_free() calls release_sock(sk) without owning a reference on the socket. This can cause use-after-free as syzbot found [1] Jakub Sitnicki already took care of a similar issue in sock_hash_free() in commit 75e68e5bf2c7 ("bpf, sockhash: Synchronize delete from bucket list on map free") [1] refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Code: 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 RSP: 0018:ffffc9000456fb60 EFLAGS: 00010246 RAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5 R10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004 R13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c30000 CR3: 000000000d08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __refcount_dec include/linux/refcount.h:344 [inline] refcount_dec include/linux/refcount.h:359 [inline] __sock_put include/net/sock.h:779 [inline] tcp_release_cb+0x2d0/0x360 net/ipv4/tcp_output.c:1092 release_sock+0xaf/0x1c0 net/core/sock.c:3468 sock_map_free+0x219/0x2c0 net/core/sock_map.c:356 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK>
References
Impacted products
Vendor Product Version
Linux Linux Version: 20ae0cb8983b05136d5293c47fadc99a8ca8ca2d
Version: 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b
Version: 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b
Version: 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b
Version: 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b
Version: 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b
Version: 5.4.14   ≤
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          "value": "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 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 \u003c0f\u003e 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\u003cTASK\u003e\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\u003c/TASK\u003e"
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    "cveId": "CVE-2022-50259",
    "datePublished": "2025-09-15T14:02:47.875Z",
    "dateReserved": "2025-09-15T13:58:00.974Z",
    "dateUpdated": "2026-10-15T21:31:19.702Z",
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-50259\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-15T21:30:46.333972Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-15T21:30:46.935Z\"}}], \"cna\": {\"title\": \"bpf, sockmap: fix race in sock_map_free()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached only through local bpf(2) SOCKMAP create/update and map teardown (close last map FD \\u2192 bpf_map_put \\u2192 bpf_map_free_deferred \\u2192 sock_map_free); it is not reachable from network packet processing.\\nAC:L - The attacker fully controls both sides of the race\\u2014populating the SOCKMAP, closing the map to schedule sock_map_free, and concurrently closing enrolled sockets\\u2014so success does not depend on conditions outside their influence.\\nPR:L - SOCKMAP creation needs capable(CAP_NET_ADMIN), but that capability is commonly granted to networking containers and delegated via BPF tokens; this matches established CNA PR:L scoring for the same sock_map/sk_psock subsystem when uncertain toward higher severity.\\nUI:N - The attacker performs map create/update, map close, and concurrent socket close entirely in their own threads; no separate victim action is required.\\nS:U - The use-after-free of struct sock remains inside the host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\\nC:H - sock_map_free() can lock/release a socket after its last reference is dropped, yielding a use-after-free of struct sock whose fields (including protocol ops) can be reclaimed for arbitrary kernel disclosure.\\nI:H - A freed struct sock is a classic heap-spray target; reuse of sk_prot/callback pointers during release_sock/tcp_release_cb enables arbitrary write and control-flow hijacking primitives.\\nA:H - The syzbot report shows refcount_warn_saturate on a dead socket during release_sock, and any sock UAF can oops/panic the kernel even when not fully exploited.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"20ae0cb8983b05136d5293c47fadc99a8ca8ca2d\", \"lessThan\": \"4cabc3af4a6f36c222fecb15858c1060e59218e7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b\", \"lessThan\": \"be719496ae6a7fc325e9e5056a52f63ebc84cc0c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b\", \"lessThan\": \"a443c55d96dede82a724df6e70a318ad15c199e1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b\", \"lessThan\": \"e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b\", \"lessThan\": \"5c3568166129bc73fd6b37748d2d8f95cd8f22f3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b\", \"lessThan\": \"0a182f8d607464911756b4dbef5d6cad8de22469\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.4.14\", \"lessThan\": \"5.4.229\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/core/sock_map.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.229\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/sock_map.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7\"}, {\"url\": \"https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0c\"}, {\"url\": \"https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1\"}, {\"url\": \"https://git.kernel.org/stable/c/e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62\"}, {\"url\": \"https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3\"}, {\"url\": \"https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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 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 \u003c0f\u003e 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\u003cTASK\u003e\\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\u003c/TASK\u003e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.229\", \"versionStartIncluding\": \"5.4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.163\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.86\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.16\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.2\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:57:59.099Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-50259\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:31:19.702Z\", \"dateReserved\": \"2025-09-15T13:58:00.974Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:02:47.875Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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