CVE-2026-53059High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: dm log: fix out-of-bounds write due to region_count overflow The local variable region_count in create_log_context() is declared as unsigned int (32-bit), but dm_secto…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
dm log: fix out-of-bounds write due to region_count overflow
The local variable region_count in create_log_context() is declared as unsigned int (32-bit), but dm_sector_div_up() returns sector_t (64-bit). When a device-mapper target has a sufficiently large ti->len with a small region_size, the division result can exceed UINT_MAX. The truncated value is then used to calculate bitset_size, causing clean_bits, sync_bits, and recovering_bits to be allocated far smaller than needed for the actual number of regions.
Subsequent log operations (log_set_bit, log_clear_bit, log_test_bit) use region indices derived from the full untruncated region space, causing out-of-bounds writes to kernel heap memory allocated by vmalloc.
This can be reproduced by creating a mirror target whose region_count overflows 32 bits:
dmsetup create bigzero --table '0 8589934594 zero'
dmsetup create mymirror --table '0 8589934594 mirror
core 2 2 nosync 2 /dev/mapper/bigzero 0
/dev/mapper/bigzero 0'
The status output confirms the truncation (sync_count=1 instead of 4294967297, because 0x100000001 was truncated to 1):
$ dmsetup status mymirror 0 8589934594 mirror 2 254:1 254:1 1/4294967297 ...
This leads to a kernel crash in core_in_sync:
BUG: scheduling while atomic: (udev-worker)/9150/0x00000000 RIP: 0010:core_in_sync+0x14/0x30 [dm_log] CR2: 0000000000000008 Fixing recursive fault but reboot is needed!
Fix by widening the local region_count to sector_t and adding an explicit overflow check before the value is assigned to lc->region_count.
linux_kernel >= 2.6.12.1, < 5.10.258linux_kernel >= 5.11, < 5.15.209linux_kernel >= 5.16, < 6.1.175linux_kernel >= 6.2, < 6.6.141linux_kernel >= 6.7, < 6.12.91linux_kernel >= 6.13, < 6.18.33linux_kernel >= 6.19, < 7.0.10linux_kernel = 2.6.12Upgrade past the affected range:
linux_kernel 7.0.10Connected by shared product, vendor, weakness, or advisory.
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