CVE - CVE-2022-49171

CVE-ID
CVE-2022-49171	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: don't BUG if someone dirty pages without asking ext4 first [un]pin_user_pages_remote is dirtying pages without properly warning the file system in advance. A related race was noted by Jan Kara in 2018[1]; however, more recently instead of it being a very hard-to-hit race, it could be reliably triggered by process_vm_writev(2) which was discovered by Syzbot[2]. This is technically a bug in mm/gup.c, but arguably ext4 is fragile in that if some other kernel subsystem dirty pages without properly notifying the file system using page_mkwrite(), ext4 will BUG, while other file systems will not BUG (although data will still be lost). So instead of crashing with a BUG, issue a warning (since there may be potential data loss) and just mark the page as clean to avoid unprivileged denial of service attacks until the problem can be properly fixed. More discussion and background can be found in the thread starting at [2]. [1] https://lore.kernel.org/linux-mm/20180103100430.GE4911@quack2.suse.cz [2] https://lore.kernel.org/r/Yg0m6IjcNmfaSokM@google.com
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/0d3a6926f7e8be3c897fa46216ce13b119a9f56a URL:https://git.kernel.org/stable/c/0d3a6926f7e8be3c897fa46216ce13b119a9f56a MISC:https://git.kernel.org/stable/c/330d0e44fc5a47c27df958ecdd4693a3cb1d8b81 URL:https://git.kernel.org/stable/c/330d0e44fc5a47c27df958ecdd4693a3cb1d8b81 MISC:https://git.kernel.org/stable/c/343117559ef41e992e326f7a92da1a8f254dfa8c URL:https://git.kernel.org/stable/c/343117559ef41e992e326f7a92da1a8f254dfa8c MISC:https://git.kernel.org/stable/c/5a016c053f426a73752c3b41b60b497b58694d48 URL:https://git.kernel.org/stable/c/5a016c053f426a73752c3b41b60b497b58694d48 MISC:https://git.kernel.org/stable/c/5db60e76edf5680ff1f3a7221036fc44b308f146 URL:https://git.kernel.org/stable/c/5db60e76edf5680ff1f3a7221036fc44b308f146 MISC:https://git.kernel.org/stable/c/677c9d30e8487bee6c8e3b034070319d98f6e203 URL:https://git.kernel.org/stable/c/677c9d30e8487bee6c8e3b034070319d98f6e203 MISC:https://git.kernel.org/stable/c/a0856764dc1276ad2dc7891288c2e9246bf11a37 URL:https://git.kernel.org/stable/c/a0856764dc1276ad2dc7891288c2e9246bf11a37 MISC:https://git.kernel.org/stable/c/cc5095747edfb054ca2068d01af20be3fcc3634f URL:https://git.kernel.org/stable/c/cc5095747edfb054ca2068d01af20be3fcc3634f MISC:https://git.kernel.org/stable/c/d666dfaa571465a19f014534a214c255ea33f301 URL:https://git.kernel.org/stable/c/d666dfaa571465a19f014534a214c255ea33f301
Assigning CNA
kernel.org
Date Record Created
20250226	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 (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)