CVE - CVE-2024-49870

CVE-ID
CVE-2024-49870	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: cachefiles: fix dentry leak in cachefiles_open_file() A dentry leak may be caused when a lookup cookie and a cull are concurrent: P1 \| P2 ----------------------------------------------------------- cachefiles_lookup_cookie cachefiles_look_up_object lookup_one_positive_unlocked // get dentry cachefiles_cull inode->i_flags \|= S_KERNEL_FILE; cachefiles_open_file cachefiles_mark_inode_in_use __cachefiles_mark_inode_in_use can_use = false if (!(inode->i_flags & S_KERNEL_FILE)) can_use = true return false return false // Returns an error but doesn't put dentry After that the following WARNING will be triggered when the backend folder is umounted: ================================================================== BUG: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img} still in use (1) [unmount of ext4 sda] WARNING: CPU: 4 PID: 359261 at fs/dcache.c:1767 umount_check+0x5d/0x70 CPU: 4 PID: 359261 Comm: umount Not tainted 6.6.0-dirty #25 RIP: 0010:umount_check+0x5d/0x70 Call Trace: <TASK> d_walk+0xda/0x2b0 do_one_tree+0x20/0x40 shrink_dcache_for_umount+0x2c/0x90 generic_shutdown_super+0x20/0x160 kill_block_super+0x1a/0x40 ext4_kill_sb+0x22/0x40 deactivate_locked_super+0x35/0x80 cleanup_mnt+0x104/0x160 ================================================================== Whether cachefiles_open_file() returns true or false, the reference count obtained by lookup_positive_unlocked() in cachefiles_look_up_object() should be released. Therefore release that reference count in cachefiles_look_up_object() to fix the above issue and simplify the code.
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/7fa2382f97421978514a419c93054eca69f5247b URL:https://git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247b MISC:https://git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151 URL:https://git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151 MISC:https://git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410 URL:https://git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410 MISC:https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c URL:https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c MISC:https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1 URL:https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1
Assigning CNA
kernel.org
Date Record Created
20241021	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 (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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