CVE-2026-52921
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel netfilter/ipset subsystem, a vulnerability was found in IPv4 range iteration for hash:ip,mark, hash:ip,port, hash:ip,port,ip, and hash:ip,port,net sets. The 32-bit iterator may advance past the end of the requested range after processing the last address, causing a later retry to continue from an unintended position.
Risk Assessment
The organization may experience incorrect behavior of ipset-based network filtering rules, potentially leading to improper traffic allowance or blocking, bypassing security policies.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit in the netfilter branch). A system reboot is required after the update.
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- CVE-2026-80542Unknown
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In the Linux kernel XFS filesystem, during directory tree repair, a self-referential directory may be detected. In such a case, the repair code attempts to lock the same inode twice (double iolock/ilock), leading to a deadlock. The fix detects this corner case and handles it appropriately.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash:* range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last address in the requested range has been processed. Advancing it once more can move the traversal state past the end of the request, so a later retry may continue from an unintended position. Handle the iterator increment explicitly at the end of the loop and stop once the upper bound has been processed. This keeps the existing retry behaviour intact for valid ranges while preventing traversal from continuing past the original boundary.