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dm log: fix out-of-bounds write due to region_count overflow (Linux Linux)

CVE-2026-53059
MEDIUM 6.3

En bref

Source
NVD
EPSS
EPSS 0.14 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

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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.

Faiblesses (CWE)

  • CWE-190 — Débordement d'entier
  • CWE-787 — Écriture hors limites

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 6.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Hredhat-SADP
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)
CVSS 3.1MEDIUM 6.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 44ab8875ae4a2842bde2d756bed195d375e0debb ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < defe483e47173768c227532694dc78cb65db5f09 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3ec74da927b4e171a6fc0e77b1188ba4d019af51 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d4ac87567f86a55c3c92e9a5144dcd943a9772a1 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b455903eed4558982be0811f5b7f44f6bbc4ff57
Linux · Linuxaffected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.141 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD