vulnerability
Red Hat: CVE-2025-21826: kernel: netfilter: nf_tables: reject mismatching sum of field_len with set key length (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:P/I:N/A:C) | Mar 6, 2025 | Jul 9, 2025 | Jan 28, 2026 |
Severity
5
CVSS
(AV:L/AC:L/Au:S/C:P/I:N/A:C)
Published
Mar 6, 2025
Added
Jul 9, 2025
Modified
Jan 28, 2026
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: reject mismatching sum of field_len with set key length
The field length description provides the length of each separated key
field in the concatenation, each field gets rounded up to 32-bits to
calculate the pipapo rule width from pipapo_init(). The set key length
provides the total size of the key aligned to 32-bits.
Register-based arithmetics still allows for combining mismatching set
key length and field length description, eg. set key length 10 and field
description [ 5, 4 ] leading to pipapo width of 12.
Solutions
no-fix-redhat-rpm-packageredhat-upgrade-kernelredhat-upgrade-kernel-rt
References
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