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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-72105

dm-log: fix a bitset_size overflow on 32bit machines

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 44ab8875ae4a2842bde2d756bed195d375e0debb to < cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5affected
  • defe483e47173768c227532694dc78cb65db5f09 to < 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723affected
  • 3ec74da927b4e171a6fc0e77b1188ba4d019af51 to < 567602fa72d57169365cbc589e0b8c3be900636daffected
  • d4ac87567f86a55c3c92e9a5144dcd943a9772a1 to < d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7aaffected
  • 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 to < 1c3412b584e1fb6c665ff33ba7259253bc0082cbaffected
  • b455903eed4558982be0811f5b7f44f6bbc4ff57 to < e0b0163a65758ec3a2361ae1cea407898c27f21eaffected
  • c20e36b7631d83e7535877f08af8b0af72c44b1a to < 79feb87ab2396d49b9b65e4bb815d33cc71cba47affected
  • c20e36b7631d83e7535877f08af8b0af72c44b1a to < 9743132a41f4d9d0e54c5f2adcb821b04796bab1affected
  • 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867affected
  • 5.10.258 to < 5.10.261affected
  • 5.15.209 to < 5.15.212affected
  • 6.1.175 to < 6.1.178affected
  • 6.6.141 to < 6.6.145affected
  • 6.12.91 to < 6.12.97affected
  • 6.18.33 to < 6.18.40affected
  • 7.0.10 to < 7.1affected

Linux Linux

Default version status: affected

  • 7.1affected
  • 0 to < 7.1unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References