CVE-2022-49710

Summary

In the Linux kernel, the following vulnerability has been resolved:

dm mirror log: round up region bitmap size to BITS_PER_LONG

The code in dm-log rounds up bitset_size to 32 bits. It then uses find_next_zero_bit_le on the allocated region. find_next_zero_bit_le accesses the bitmap using unsigned long pointers. So, on 64-bit architectures, it may access 4 bytes beyond the allocated size.

Fix this bug by rounding up bitset_size to BITS_PER_LONG.

This bug was found by running the lvm2 testsuite with kasan.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux29121bd0b00ebb9524971a583fea4a2f7afe8041 < ae460312875159285cef5bf3dc654593f404a1efaffected
LinuxLinux29121bd0b00ebb9524971a583fea4a2f7afe8041 < ba751f0d25f07aa21ce9b85372a3792bf7969d13affected
LinuxLinux29121bd0b00ebb9524971a583fea4a2f7afe8041 < 0d2209b54f1de0c2f99cab246d4cf2cfe24aaaa9affected
LinuxLinux29121bd0b00ebb9524971a583fea4a2f7afe8041 < 9a02f3275acc628c0d956be771405ced79ac36dfaffected
LinuxLinux29121bd0b00ebb9524971a583fea4a2f7afe8041 < 85e123c27d5cbc22cfdc01de1e2ca1d9003a02d0affected
LinuxLinux2.6.18affected
LinuxLinux0 < 2.6.18unaffected
LinuxLinux5.4.200 <= 5.4.*unaffected
LinuxLinux5.10.124 <= 5.10.*unaffected
LinuxLinux5.15.49 <= 5.15.*unaffected
LinuxLinux5.18.6 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

References