CVE-2026-53059
Full vulnerability record from the local CVENow database.
Description
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-24 17:17:18.463000
Last modified
2026-11-06 17:18:03.450000
View original CVE JSON
{
"id": "CVE-2026-53059",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-24T17:17:18.463",
"lastModified": "2026-11-06T17:18:03.450",
"vulnStatus": "Modified",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm log: fix out-of-bounds write due to region_count overflow\n\nThe local variable region_count in create_log_context() is declared as\nunsigned int (32-bit), but dm_sector_div_up() returns sector_t (64-bit).\nWhen a device-mapper target has a sufficiently large ti->len with a small\nregion_size, the division result can exceed UINT_MAX. The truncated\nvalue is then used to calculate bitset_size, causing clean_bits,\nsync_bits, and recovering_bits to be allocated far smaller than needed\nfor the actual number of regions.\n\nSubsequent log operations (log_set_bit, log_clear_bit, log_test_bit) use\nregion indices derived from the full untruncated region space, causing\nout-of-bounds writes to kernel heap memory allocated by vmalloc.\n\nThis can be reproduced by creating a mirror target whose region_count\noverflows 32 bits:\n\n dmsetup create bigzero --table '0 8589934594 zero'\n dmsetup create mymirror --table '0 8589934594 mirror \\\n core 2 2 nosync 2 /dev/mapper/bigzero 0 \\\n /dev/mapper/bigzero 0'\n\nThe status output confirms the truncation (sync_count=1 instead of\n4294967297, because 0x100000001 was truncated to 1):\n\n $ dmsetup status mymirror\n 0 8589934594 mirror 2 254:1 254:1 1/4294967297 ...\n\nThis leads to a kernel crash in core_in_sync:\n\n BUG: scheduling while atomic: (udev-worker)/9150/0x00000000\n RIP: 0010:core_in_sync+0x14/0x30 [dm_log]\n CR2: 0000000000000008\n Fixing recursive fault but reboot is needed!\n\nFix by widening the local region_count to sector_t and adding an\nexplicit overflow check before the value is assigned to lc->region_count."
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