mm/damon/core: disallow overlapping input ranges for damon_set_regions()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68164
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:02 UTC
Updated2026-08-19 17:20:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow overlapping input ranges for damon_set_regions() damon_set_regions() assumes the input ranges are sorted by the address and don't overlap each other. Hence the assumption was initially to be explicitly validated. But commit 97d482f4592f ("mm/damon/sysfs: reuse damon_set_regions() for regions setting") has mistakenly removed the validation. This can make DAMON behave in unexpected ways. At the best, the monitoring results snapshot will just look weird since there will be overlapping regions. DAMOS will also work weirdly, applying the same action multiple times for overlapping regions, and make DAMOS quota weird. More seriously, depending on the setup and regions updates sequence, negative size regions can be made. It will trigger WARN_ONCE() if the kernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the monitoring results, the negative size region can further trigger division by zero in damon_merge_two_regions(). Note that some of the consequences including the WARN_ONCE() and the divide by zero depend on commits that were introduced after the root cause commit 97d482f4592f ("mm/damon/sysfs: reuse damon_set_regions() for regions setting"). Fix the problems by checking the assumption and returning an error if the input ranges don't meet the assumption. The issue was discovered [1] by Sashiko.

Risk And Classification

EPSS: 0.002090000 probability, percentile 0.113400000 (date 2026-08-19)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c a5c453fffb6f2ce75fc10b5d8bc475f1758010bd git Not specified
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c 4b4a3e7ef7bb622237495db9ba4dfd7417d6530e git Not specified
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c 06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd git Not specified
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c 6ce0db97fb37ab8cf8596edca0e3de8618ab009a git Not specified
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c e33adf96afb5883f84b0d98747976bde293e33cb git Not specified
CNA Linux Linux affected 97d482f4592fde2322c319f07bc54f3a0d37861c 954157679ec34661c2e87e7eb796104a797c32db git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/954157679ec34661c2e87e7eb796104a797c32db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5c453fffb6f2ce75fc10b5d8bc475f1758010bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e33adf96afb5883f84b0d98747976bde293e33cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6ce0db97fb37ab8cf8596edca0e3de8618ab009a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b4a3e7ef7bb622237495db9ba4dfd7417d6530e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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