CVE-2024-39276 (GCVE-0-2024-39276)
Vulnerability from cvelistv5 – Published: 2024-06-25 14:22 – Updated: 2026-05-23 15:49
VLAI
EPSS
VEX
Title
ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()
Syzbot reports a warning as follows:
============================================
WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290
Modules linked in:
CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7
RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419
Call Trace:
<TASK>
ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375
generic_shutdown_super+0x136/0x2d0 fs/super.c:641
kill_block_super+0x44/0x90 fs/super.c:1675
ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327
[...]
============================================
This is because when finding an entry in ext4_xattr_block_cache_find(), if
ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown
in the __entry_find(), won't be put away, and eventually trigger the above
issue in mb_cache_destroy() due to reference count leakage.
So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-25 15:26 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b878c8a7f08f0c225b6a46ba1ac867e9c5d17807 , < 9ad75e78747b5a50dc5a52f0f8e92e920a653f16
(git)
Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < 896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < 76dc776153a47372719d664e0fc50d6355791abb (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < 681ff9a09accd8a4379f8bd30b7a1641ee19bb3e (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < e941b712e758f615d311946bf98216e79145ccd9 (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < a95df6f04f2c37291adf26a74205cde0314d4577 (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < b37c0edef4e66fb21a2fbc211471195a383e5ab8 (git) Affected: fb265c9cb49e2074ddcdd4de99728aefdd3b3592 , < 0c0b4a49d3e7f49690a6827a41faeffad5df7e21 (git) Affected: 9da1f6d06b7a6d068e68fcfd7cbbf6b586d888e1 (git) Affected: 81313ed2c705d958744882a269bf4a5e3ddec95e (git) Affected: 4.19.14 , < 4.19.316 (semver) Affected: 4.14.92 , < 4.15 (semver) Affected: 4.20.1 , < 4.21 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.0
Unaffected: 0 , < 5.0 (semver) Unaffected: 4.19.316 , ≤ 4.19.* (semver) Unaffected: 5.4.278 , ≤ 5.4.* (semver) Unaffected: 5.10.219 , ≤ 5.10.* (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.94 , ≤ 6.1.* (semver) Unaffected: 6.6.34 , ≤ 6.6.* (semver) Unaffected: 6.9.5 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix mb_cache_entry\u0027s e_refcnt leak in ext4_xattr_block_cache_find()\\n\\nSyzbot reports a warning as follows:\\n\\n============================================\\nWARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290\\nModules linked in:\\nCPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7\\nRIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419\\nCall Trace:\\n \u003cTASK\u003e\\n ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375\\n generic_shutdown_super+0x136/0x2d0 fs/super.c:641\\n kill_block_super+0x44/0x90 fs/super.c:1675\\n ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327\\n[...]\\n============================================\\n\\nThis is because when finding an entry in ext4_xattr_block_cache_find(), if\\next4_sb_bread() returns -ENOMEM, the ce\u0027s e_refcnt, which has already grown\\nin the __entry_find(), won\u0027t be put away, and eventually trigger the above\\nissue in mb_cache_destroy() due to reference count leakage.\\n\\nSo call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: soluciona la fuga de e_refcnt de mb_cache_entry en ext4_xattr_block_cache_find() Syzbot informa una advertencia de la siguiente manera: ======================= ======================= ADVERTENCIA: CPU: 0 PID: 5075 en fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 M\\u00f3dulos vinculados en: CPU: 0 PID: 5075 Comm: syz-executor199 No contaminado 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Seguimiento de llamadas: ext4_put_super+0x6d4/0xcd0 fs/ext4/super .c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] === ========================================= Esto se debe a que al encontrar una entrada en ext4_xattr_block_cache_find (), si ext4_sb_bread() devuelve -ENOMEM, el e_refcnt del ce, que ya ha crecido en __entry_find(), no se guardar\\u00e1 y, eventualmente, desencadenar\\u00e1 el problema anterior en mb_cache_destroy() debido a una fuga del recuento de referencias. Entonces llame a mb_cache_entry_put() en la rama de error -ENOMEM como soluci\\u00f3n r\\u00e1pida.\"}]",
"id": "CVE-2024-39276",
"lastModified": "2024-11-21T09:27:23.107",
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"cve": "CVE-2024-39276",
"id": "CVE-2024-39276",
"initial_release_date": "2024-06-25T00:00:00+00:00",
"product_status:fixed": "709",
"product_status:known_affected": "64",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ext4: fix mb_cache_entry\u0027s e_refcnt leak in ext4_xattr_block_cache_find()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-39276.json",
"version": "3"
},
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"current_release_date": "2026-09-07T16:40:01Z",
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"initial_release_date": "2024-06-26T23:17:37Z",
"product_status:known_affected": "471",
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"product_status:recommended": "671",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-39276",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-39276.json",
"version": "95"
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\"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"76dc776153a47372719d664e0fc50d6355791abb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"681ff9a09accd8a4379f8bd30b7a1641ee19bb3e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"e941b712e758f615d311946bf98216e79145ccd9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"a95df6f04f2c37291adf26a74205cde0314d4577\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"b37c0edef4e66fb21a2fbc211471195a383e5ab8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb265c9cb49e2074ddcdd4de99728aefdd3b3592\", \"lessThan\": \"0c0b4a49d3e7f49690a6827a41faeffad5df7e21\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9da1f6d06b7a6d068e68fcfd7cbbf6b586d888e1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"81313ed2c705d958744882a269bf4a5e3ddec95e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.19.14\", \"lessThan\": \"4.19.316\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.92\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.20.1\", \"lessThan\": \"4.21\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/ext4/xattr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.316\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.278\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.219\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.161\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/xattr.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16\"}, {\"url\": \"https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483\"}, {\"url\": \"https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb\"}, {\"url\": \"https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e\"}, {\"url\": \"https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9\"}, {\"url\": \"https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577\"}, {\"url\": \"https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8\"}, {\"url\": \"https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix mb_cache_entry\u0027s e_refcnt leak in ext4_xattr_block_cache_find()\\n\\nSyzbot reports a warning as follows:\\n\\n============================================\\nWARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290\\nModules linked in:\\nCPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7\\nRIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419\\nCall Trace:\\n \u003cTASK\u003e\\n ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375\\n generic_shutdown_super+0x136/0x2d0 fs/super.c:641\\n kill_block_super+0x44/0x90 fs/super.c:1675\\n ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327\\n[...]\\n============================================\\n\\nThis is because when finding an entry in ext4_xattr_block_cache_find(), if\\next4_sb_bread() returns -ENOMEM, the ce\u0027s e_refcnt, which has already grown\\nin the __entry_find(), won\u0027t be put away, and eventually trigger the above\\nissue in mb_cache_destroy() due to reference count leakage.\\n\\nSo call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.316\", \"versionStartIncluding\": \"4.19.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.278\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.94\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.34\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.5\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.92\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.20.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:49:57.161Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-39276\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:49:57.161Z\", \"dateReserved\": \"2024-06-24T13:53:25.552Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-25T14:22:38.886Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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