CVE-2026-74564

netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH

State: Published
Severity: 7.1 High
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH

The XT_HASHLIMIT_RATE_MATCH flag mode changes the semantics of the dsthash_ent structure which represents an entry in the hashtable. There is a union area which uses a different layout to express the rate match mode.

Update .checkentry path to validate the XT_HASHLIMIT_RATE_MATCH mode flag is requested by two or more different rules that refer to the same hashtable. Otherwise, uninitialized access to the burst field in the union is possible.

Reject the use of the XT_HASHLIMIT_RATE_MATCH mode flag if set on by revision less than 3 too.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	bea74641e3786d51dcf1175527cc1781420961c9 to before 402befce5854c195058cf4bab7c78ca286068a26Affected bea74641e3786d51dcf1175527cc1781420961c9 to before dee686b5e7f21180538ff719867702f411c8eb5cAffected bea74641e3786d51dcf1175527cc1781420961c9 to before f76ab783e7d8d33e33dd7dfa697297f70d57b0e8Affected bea74641e3786d51dcf1175527cc1781420961c9 to before 24683fea1f06bd3bd2707b99460e859bc6464c22Affected bea74641e3786d51dcf1175527cc1781420961c9 to before 32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0Affected bea74641e3786d51dcf1175527cc1781420961c9 to before d186f77d18bdfb252d401ff992ca3001a6a65a0fAffected bea74641e3786d51dcf1175527cc1781420961c9 to before 06a76334243ccd875a981aa8bb46c0f931ef1e3bAffected bea74641e3786d51dcf1175527cc1781420961c9 to before 305b63e1402267459fdabb183af4527f6799eebfAffected
LinuxLinux	4.14Affected before 4.14Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.151 through 6.6.Not affected 6.12.103 through 6.12.Not affected 6.18.44 through 6.18.Not affected 7.1.8 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

bea74641e3786d51dcf1175527cc1781420961c9 to before 402befce5854c195058cf4bab7c78ca286068a26Affected
bea74641e3786d51dcf1175527cc1781420961c9 to before dee686b5e7f21180538ff719867702f411c8eb5cAffected
bea74641e3786d51dcf1175527cc1781420961c9 to before f76ab783e7d8d33e33dd7dfa697297f70d57b0e8Affected
bea74641e3786d51dcf1175527cc1781420961c9 to before 24683fea1f06bd3bd2707b99460e859bc6464c22Affected
bea74641e3786d51dcf1175527cc1781420961c9 to before 32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0Affected
bea74641e3786d51dcf1175527cc1781420961c9 to before d186f77d18bdfb252d401ff992ca3001a6a65a0fAffected
bea74641e3786d51dcf1175527cc1781420961c9 to before 06a76334243ccd875a981aa8bb46c0f931ef1e3bAffected
bea74641e3786d51dcf1175527cc1781420961c9 to before 305b63e1402267459fdabb183af4527f6799eebfAffected

LinuxLinux

4.14Affected
before 4.14Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.151 through 6.6.*Not affected
6.12.103 through 6.12.*Not affected
6.18.44 through 6.18.*Not affected
7.1.8 through 7.1.*Not affected
7.2 and laterNot affected

References

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