cve-2024-39463
Vulnerability from cvelistv5
Published
2024-06-25 14:25
Modified
2024-12-19 09:06
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: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it: UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://www.zerodayinitiative.com/advisories/ZDI-24-1194/
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4Patch
Impacted products
Vendor Product Version
Linux Linux Version: 5.11
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-39463\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-25T15:15:14.760\",\"lastModified\":\"2024-11-21T09:27:43.050\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p: add missing locking around taking dentry fid list\\n\\nFix a use-after-free on dentry\u0027s d_fsdata fid list when a thread\\nlooks up a fid through dentry while another thread unlinks it:\\n\\nUAF thread:\\nrefcount_t: addition on 0; use-after-free.\\n p9_fid_get linux/./include/net/9p/client.h:262\\n v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129\\n v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181\\n v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314\\n v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400\\n vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248\\n\\nFreed by:\\n p9_fid_destroy (inlined)\\n p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456\\n p9_fid_put linux/./include/net/9p/client.h:278\\n v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55\\n v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518\\n vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335\\n\\nThe problem is that d_fsdata was not accessed under d_lock, because\\nd_release() normally is only called once the dentry is otherwise no\\nlonger accessible but since we also call it explicitly in v9fs_remove\\nthat lock is required:\\nmove the hlist out of the dentry under lock then unref its fids once\\nthey are no longer accessible.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: 9p: agregar bloqueo faltante al tomar la lista de fid de dentry. Se corrigi\u00f3 un use-after-free en la lista de fid d_fsdata de dentry cuando un subproceso busca un fid a trav\u00e9s de dentry mientras otro subproceso lo desvincula: UAF hilo: refcount_t: suma en 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 Linux /fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Liberado por: p9_fid_destroy (en l\u00ednea) desconocido+0xb0 /0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 El problema es que no se accedi\u00f3 a d_fsdata bajo d_lock, porque normalmente d_release() solo se llama una vez que dentry no est\u00e1 disponible. ya no es accesible, pero como tambi\u00e9n lo llamamos expl\u00edcitamente en v9fs_remove, ese bloqueo es necesario: mueva la hlist fuera del dentry bajo bloqueo y luego elimine la referencia de sus fids una vez que ya no sean accesibles.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"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:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"6.1.94\",\"matchCriteriaId\":\"0F1BDCB0-B227-4406-81D0-90429CAF5F99\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.34\",\"matchCriteriaId\":\"6BD9DCFD-0342-4039-B8CE-70F26DB7173B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.9.5\",\"matchCriteriaId\":\"8366481F-770F-4850-9D0F-2977BD97D5C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"2EBB4392-5FA6-4DA9-9772-8F9C750109FA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-24-1194/\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}"
  }
}


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