CVE-2026-72105: Linux Vulnerability (CVSS 7.8)

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 44ab8875ae4a2842bde2d756bed195d375e0debb, < cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5; >= defe483e47173768c227532694dc78cb65db5f09, < 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723; >= 3ec74da927b4e171a6fc0e77b1188ba4d019af51, < 567602fa72d57169365cbc589e0b8c3be900636d; >= d4ac87567f86a55c3c92e9a5144dcd943a9772a1, < d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a; >= 12bd5b88e91a02785244ff1d20fb157e96e9cdc8, < 1c3412b584e1fb6c665ff33ba7259253bc0082cb; >= b455903eed4558982be0811f5b7f44f6bbc4ff57, < e0b0163a65758ec3a2361ae1cea407898c27f21e; >= c20e36b7631d83e7535877f08af8b0af72c44b1a, < 79feb87ab2396d49b9b65e4bb815d33cc71cba47; >= c20e36b7631d83e7535877f08af8b0af72c44b1a, < 9743132a41f4d9d0e54c5f2adcb821b04796bab1; 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867; >= 5.10.258, < 5.10.261; >= 5.15.209, < 5.15.212; >= 6.1.175, < 6.1.178; >= 6.6.141, < 6.6.145; >= 6.12.91, < 6.12.97; >= 6.18.33, < 6.18.40; >= 7.0.10, < 7.1
Linux	Linux	7.1

References

Timeline

Published: Aug 15, 2026
Last Modified: Aug 17, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-72105?

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.

How severe is CVE-2026-72105?

CVE-2026-72105 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-72105?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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