{"id":"CVE-2026-53059","title":"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_secto…","summary":"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_secto…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787","CWE-190"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 5.10.258","linux_kernel >= 5.11, < 5.15.209","linux_kernel >= 5.16, < 6.1.175","linux_kernel >= 6.2, < 6.6.141","linux_kernel >= 6.7, < 6.12.91","linux_kernel >= 6.13, < 6.18.33","linux_kernel >= 6.19, < 7.0.10","linux_kernel = 2.6.12"],"patched":["linux_kernel 7.0.10"],"published":"2026-06-24","updated":"2026-07-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53059","references":[{"url":"https://git.kernel.org/stable/c/12bd5b88e91a02785244ff1d20fb157e96e9cdc8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3ec74da927b4e171a6fc0e77b1188ba4d019af51","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/44ab8875ae4a2842bde2d756bed195d375e0debb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4ec8323b9f0764a14d532b1ae9b87f8a9fecb867","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b455903eed4558982be0811f5b7f44f6bbc4ff57","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c20e36b7631d83e7535877f08af8b0af72c44b1a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d4ac87567f86a55c3c92e9a5144dcd943a9772a1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/defe483e47173768c227532694dc78cb65db5f09","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://access.redhat.com/errata/RHSA-2026:45114","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:45115","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:45116","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:45192","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47248","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-53059","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2492277","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53059.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53059"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53059"},{"url":"https://lore.kernel.org/linux-cve-announce/2026062401-CVE-2026-53059-f32e@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:61692"},{"url":"https://access.redhat.com/errata/RHSA-2026:63189"},{"url":"https://access.redhat.com/errata/RHSA-2026:55445"},{"url":"https://access.redhat.com/errata/RHSA-2026:59662"},{"url":"https://access.redhat.com/errata/RHSA-2026:73645"},{"url":"https://access.redhat.com/errata/RHSA-2026:56574"},{"url":"https://access.redhat.com/errata/RHSA-2026:53989"},{"url":"https://access.redhat.com/errata/RHSA-2026:52649"},{"url":"https://access.redhat.com/errata/RHSA-2026:59663"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.0014,"epssPercentile":0.03353,"ingestedAt":"2026-07-29T13:46:57.312Z","scores":{"nvd":7.8,"vendor":6.3},"slug":"CVE-2026-53059","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 2.6.12.1, < 5.10.258`\n- `linux_kernel >= 5.11, < 5.15.209`\n- `linux_kernel >= 5.16, < 6.1.175`\n- `linux_kernel >= 6.2, < 6.6.141`\n- `linux_kernel >= 6.7, < 6.12.91`\n- `linux_kernel >= 6.13, < 6.18.33`\n- `linux_kernel >= 6.19, < 7.0.10`\n- `linux_kernel = 2.6.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.10`\n\n## Vendor advisories\n\n- **RHSA-2026:61692** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61692)\n- **RHSA-2026:63189** · Red Hat · fixed in: Red Hat Enterprise Linux for Real Time (v. 7 ELS) · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63189)\n- **RHSA-2026:55445** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55445)\n- **RHSA-2026:45114** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:45114)\n- **RHSA-2026:59662** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:59662)\n- **RHSA-2026:73645** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73645)\n- **RHSA-2026:56574** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6) · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56574)\n- **RHSA-2026:45192** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-07-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:45192)\n- **RHSA-2026:45115** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:45115)\n- **RHSA-2026:47248** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:47248)\n- **RHSA-2026:53989** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · released 2026-08-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:53989)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53059.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}