CVE - CVE-2024-49883

CVE-ID
CVE-2024-49883	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: ext4: aovid use-after-free in ext4_ext_insert_extent() As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values: ext4_ext_insert_extent path = ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); ppath = path = NULL; path = kcalloc() = 3000 ppath = 3000; return path; /* here path is still 2000, UAF! / eh = path[depth].p_hdr ================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...] Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ================================================================== So use ppath to update the path to avoid the above problem.
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/51db04892a993cace63415be99848970a0f15ef2 URL:https://git.kernel.org/stable/c/51db04892a993cace63415be99848970a0f15ef2 MISC:https://git.kernel.org/stable/c/5e811066c5ab709b070659197dccfb80ab650ddd URL:https://git.kernel.org/stable/c/5e811066c5ab709b070659197dccfb80ab650ddd MISC:https://git.kernel.org/stable/c/8162ee5d94b8c0351be0a9321be134872a7654a1 URL:https://git.kernel.org/stable/c/8162ee5d94b8c0351be0a9321be134872a7654a1 MISC:https://git.kernel.org/stable/c/9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a URL:https://git.kernel.org/stable/c/9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a MISC:https://git.kernel.org/stable/c/a164f3a432aae62ca23d03e6d926b122ee5b860d URL:https://git.kernel.org/stable/c/a164f3a432aae62ca23d03e6d926b122ee5b860d MISC:https://git.kernel.org/stable/c/beb7b66fb489041c50c6473100b383f7a51648fc URL:https://git.kernel.org/stable/c/beb7b66fb489041c50c6473100b383f7a51648fc MISC:https://git.kernel.org/stable/c/bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b URL:https://git.kernel.org/stable/c/bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b
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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