CVE-2022-49171None▾ SunlitIn 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 re…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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/[email protected] [2] https://lore.kernel.org/r/[email protected]
Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 5db60e76edf5680ff1f3a7221036fc44b308f146Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < d666dfaa571465a19f014534a214c255ea33f301Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 0d3a6926f7e8be3c897fa46216ce13b119a9f56aLinux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 5a016c053f426a73752c3b41b60b497b58694d48Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 330d0e44fc5a47c27df958ecdd4693a3cb1d8b81Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < a0856764dc1276ad2dc7891288c2e9246bf11a37Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 343117559ef41e992e326f7a92da1a8f254dfa8cLinux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 677c9d30e8487bee6c8e3b034070319d98f6e203Linux >= a42afc5f56f319107e987aa6adf2f65d93d527c7 < cc5095747edfb054ca2068d01af20be3fcc3634fLinux 2.6.37Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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