CVE-2024-39500 (GCVE-0-2024-39500)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2026-01-19 12:17
VLAI?
Title
sock_map: avoid race between sock_map_close and sk_psock_put
Summary
In the Linux kernel, the following vulnerability has been resolved: sock_map: avoid race between sock_map_close and sk_psock_put sk_psock_get will return NULL if the refcount of psock has gone to 0, which will happen when the last call of sk_psock_put is done. However, sk_psock_drop may not have finished yet, so the close callback will still point to sock_map_close despite psock being NULL. This can be reproduced with a thread deleting an element from the sock map, while the second one creates a socket, adds it to the map and closes it. That will trigger the WARN_ON_ONCE: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7220 at net/core/sock_map.c:1701 sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701 Modules linked in: CPU: 1 PID: 7220 Comm: syz-executor380 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701 Code: 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 RSP: 0018:ffffc9000441fda8 EFLAGS: 00010293 RAX: ffffffff89731ae1 RBX: ffffffff94b87540 RCX: ffff888029470000 RDX: 0000000000000000 RSI: ffffffff8bcab5c0 RDI: ffffffff8c1faba0 RBP: 0000000000000000 R08: ffffffff92f9b61f R09: 1ffffffff25f36c3 R10: dffffc0000000000 R11: fffffbfff25f36c4 R12: ffffffff89731840 R13: ffff88804b587000 R14: ffff88804b587000 R15: ffffffff89731870 FS: 000055555e080380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000207d4000 CR4: 0000000000350ef0 Call Trace: <TASK> unix_release+0x87/0xc0 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0xbe/0x240 net/socket.c:1421 __fput+0x42b/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb37d618070 Code: 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 RSP: 002b:00007ffcd4a525d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fb37d618070 RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000100000000 R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Use sk_psock, which will only check that the pointer is not been set to NULL yet, which should only happen after the callbacks are restored. If, then, a reference can still be gotten, we may call sk_psock_stop and cancel psock->work. As suggested by Paolo Abeni, reorder the condition so the control flow is less convoluted. After that change, the reproducer does not trigger the WARN_ON_ONCE anymore.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: aadb2bb83ff789de63b48b4edeab7329423a50d3 , < 4959ffc65a0e94f8acaac20deac49f89e6ded52d (git)
Affected: aadb2bb83ff789de63b48b4edeab7329423a50d3 , < 5eabdf17fed2ad41b836bb4055ec36d95e512c50 (git)
Affected: aadb2bb83ff789de63b48b4edeab7329423a50d3 , < e946428439a0d2079959f5603256ac51b6047017 (git)
Affected: aadb2bb83ff789de63b48b4edeab7329423a50d3 , < 3627605de498639a3c586c8684d12c89cba11073 (git)
Affected: aadb2bb83ff789de63b48b4edeab7329423a50d3 , < 4b4647add7d3c8530493f7247d11e257ee425bf0 (git)
Affected: c4896f5fd83664a50ac4fef4131a265d15734e5a (git)
Create a notification for this product.
    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.162 , ≤ 5.15.* (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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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 \u003c0f\u003e 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 \u003cTASK\u003e\\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 \u003c48\u003e 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 \u003c/TASK\u003e\\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-\u003ework.\\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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.162\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.248\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-19T12:17:48.298Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-39500\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-19T12:17:48.298Z\", \"dateReserved\": \"2024-06-25T14:23:23.751Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:34.317Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.