cbcvebase.
CVE-2022-49171
published 2025-02-26

CVE-2022-49171: 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…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.27%
19.0th percentile
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]

Affected

23 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.17.3-1 (bookworm)linux 5.17.3-1 (bookworm)
linuxlinux——
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 5db60e76edf5680ff1f3a7221036fc44b308f1465db60e76edf5680ff1f3a7221036fc44b308f146
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < d666dfaa571465a19f014534a214c255ea33f301d666dfaa571465a19f014534a214c255ea33f301
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 0d3a6926f7e8be3c897fa46216ce13b119a9f56a0d3a6926f7e8be3c897fa46216ce13b119a9f56a
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 5a016c053f426a73752c3b41b60b497b58694d485a016c053f426a73752c3b41b60b497b58694d48
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 330d0e44fc5a47c27df958ecdd4693a3cb1d8b81330d0e44fc5a47c27df958ecdd4693a3cb1d8b81
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < a0856764dc1276ad2dc7891288c2e9246bf11a37a0856764dc1276ad2dc7891288c2e9246bf11a37
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 343117559ef41e992e326f7a92da1a8f254dfa8c343117559ef41e992e326f7a92da1a8f254dfa8c
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < 677c9d30e8487bee6c8e3b034070319d98f6e203677c9d30e8487bee6c8e3b034070319d98f6e203
linuxlinux>= a42afc5f56f319107e987aa6adf2f65d93d527c7 < cc5095747edfb054ca2068d01af20be3fcc3634fcc5095747edfb054ca2068d01af20be3fcc3634f
linuxlinux_kernel< 4.9.3114.9.311
linuxlinux_kernel>= 0 < 5.10.113-15.10.113-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 4.10 < 4.14.2764.14.276
linuxlinux_kernel>= 4.15 < 4.19.2384.19.238
linuxlinux_kernel>= 4.20 < 5.4.1895.4.189
linuxlinux_kernel>= 5.11 < 5.15.335.15.33
linuxlinux_kernel>= 5.16 < 5.16.195.16.19
linuxlinux_kernel>= 5.17 < 5.17.25.17.2
linuxlinux_kernel>= 5.5 < 5.10.1105.10.110

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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