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CVE-2026-72105

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 44ab8875ae4a2842bde2d756bed195d375e0debb · fixed in cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5; From defe483e47173768c227532694dc78cb65db5f09 · fixed in 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723; From 3ec74da927b4e171a6fc0e77b1188ba4d019af51 · fixed in 567602fa72d57169365cbc589e0b8c3be900636d; From d4ac87567f86a55c3c92e9a5144dcd943a9772a1 · fixed in d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a; From 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 · fixed in 1c3412b584e1fb6c665ff33ba7259253bc0082cb; From b455903eed4558982be0811f5b7f44f6bbc4ff57 · fixed in e0b0163a65758ec3a2361ae1cea407898c27f21e; From c20e36b7631d83e7535877f08af8b0af72c44b1a · fixed in 79feb87ab2396d49b9b65e4bb815d33cc71cba47; From c20e36b7631d83e7535877f08af8b0af72c44b1a · fixed in 9743132a41f4d9d0e54c5f2adcb821b04796bab1; From 5.10.258 · fixed in 5.10.261; From 5.15.209 · fixed in 5.15.212; From 6.1.175 · fixed in 6.1.178; From 6.6.141 · fixed in 6.6.145; From 6.12.91 · fixed in 6.12.97; From 6.18.33 · fixed in 6.18.40; From 7.0.10 · fixed in 7.1

  • Linux Linux

    7.1

  • KernelLinux

    fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org