cve-2024-39276
Vulnerability from cvelistv5
Published
2024-06-25 14:22
Modified
2024-11-05 14:27
Summary
ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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          "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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-39276",
    "datePublished": "2024-06-25T14:22:38.886Z",
    "dateReserved": "2024-06-24T13:53:25.552Z",
    "dateUpdated": "2024-11-05T14:27:26.405Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-39276\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-25T15:15:13.903\",\"lastModified\":\"2024-11-05T15:35:15.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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