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CVE-2026-98831

UnknownEPSS 0.17%

Last modified

CVE-2026-98831 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: of/overlay: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: of/overlay: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. The store is guarded by ovcs->fragments because on the allocation-failure path cnt still holds the counting pass total while there is no fragments array; everywhere else cnt only counts fully-initialized fragments.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < c654f283d7db20648a5bbf979209f78d4fa9be3f; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 64517aeaa3d8b158e4d01321a095be48cb551251; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < bbe3dc64b28a14bd9ecb514bbf5115ac8472ed80; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 702b5db6e7b3865be70675d57d6fd7dde80d02b6; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 894573e2fdaeb1b15030b7eebc22615edf28a6cd; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 7a46f1917b320cc8762183b802301da02a191b6a; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 3a23fb158ba517b77a2e5258263bdfdaa480f758; >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1, < 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4
LinuxLinux4.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98831?
In the Linux kernel, the following vulnerability has been resolved: of/overlay: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. The store is guarded by ovcs->fragments because on the allocation-failure path cnt still holds the counting pass total while there is no fragments array; everywhere else cnt only counts fully-initialized fragments.
How severe is CVE-2026-98831?
Severity scoring for CVE-2026-98831 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98831?
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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Source: NVD / NIST