CVE - CVE-2024-39463

CVE-ID
CVE-2024-39463	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb URL:https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb MISC:https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409 URL:https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409 MISC:https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456 URL:https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456 MISC:https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5 URL:https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5 MISC:https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4 URL:https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4 MISC:https://www.zerodayinitiative.com/advisories/ZDI-24-1194/ URL:https://www.zerodayinitiative.com/advisories/ZDI-24-1194/
Assigning CNA
kernel.org
Date Record Created
20240625	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240625)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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