CVE-2024-39276 (GCVE-0-2024-39276)

Vulnerability from cvelistv5 – Published: 2024-06-25 14:22 – Updated: 2025-05-04 12:56
VLAI?
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
    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)
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    "datePublished": "2024-06-25T14:22:38.886Z",
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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",
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