CVE-2023-53304

netfilter: nft_set_rbtree: fix overlap expiration walk

State: Published
Severity: 5.5 Medium
Published: Sep 16, 2025
Updated: May 23, 2026
Reserved: Sep 16, 2025

Description

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

netfilter: nft_set_rbtree: fix overlap expiration walk

The lazy gc on insert that should remove timed-out entries fails to release the other half of the interval, if any.

Can be reproduced with tests/shell/testcases/sets/0044interval_overlap_0 in nftables.git and kmemleak enabled kernel.

Second bug is the use of rbe_prev vs. prev pointer. If rbe_prev() returns NULL after at least one iteration, rbe_prev points to element that is not an end interval, hence it should not be removed.

Lastly, check the genmask of the end interval if this is active in the current generation.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	7ab87a326f20c52ff4d9972052d085be951c704b to before 8284a79136c384059e85e278da2210b809730287Affected 181859bdfb9734aca449512fccaee4cacce64aed to before acaee227cf79c45a5d2d49c3e9a66333a462802cAffected 4aacf3d78424293e318c616016865380b37b9cc5 to before 893cb3c3513cf661a0ff45fe0cfa83fe27131f76Affected 2bf1435fa19d2c58054391b3bba40d5510a5758c to before 50cbb9d195c197af671869c8cadce3bd483735a0Affected 318cb24a4c3fce8140afaf84e4d45fcb76fb280b to before 89a4d1a89751a0fbd520e64091873e19cc0979e8Affected c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before cd66733932399475fe933cb3ec03e687ed401462Affected c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before f718863aca469a109895cb855e6b81fff4827d71Affected 5.10.166 to before 5.10.190Affected 5.15.91 to before 5.15.124Affected 6.1.9 to before 6.1.43Affected
LinuxLinux	6.2Affected before 6.2Not affected 5.10.190 through 5.10.Not affected 5.15.124 through 5.15.Not affected 6.1.43 through 6.1.Not affected 6.4.8 through 6.4.Not affected 6.5 and laterNot affected

Product

Versions

LinuxLinux

7ab87a326f20c52ff4d9972052d085be951c704b to before 8284a79136c384059e85e278da2210b809730287Affected
181859bdfb9734aca449512fccaee4cacce64aed to before acaee227cf79c45a5d2d49c3e9a66333a462802cAffected
4aacf3d78424293e318c616016865380b37b9cc5 to before 893cb3c3513cf661a0ff45fe0cfa83fe27131f76Affected
2bf1435fa19d2c58054391b3bba40d5510a5758c to before 50cbb9d195c197af671869c8cadce3bd483735a0Affected
318cb24a4c3fce8140afaf84e4d45fcb76fb280b to before 89a4d1a89751a0fbd520e64091873e19cc0979e8Affected
c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before cd66733932399475fe933cb3ec03e687ed401462Affected
c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before f718863aca469a109895cb855e6b81fff4827d71Affected
5.10.166 to before 5.10.190Affected
5.15.91 to before 5.15.124Affected
6.1.9 to before 6.1.43Affected

LinuxLinux

6.2Affected
before 6.2Not affected
5.10.190 through 5.10.*Not affected
5.15.124 through 5.15.*Not affected
6.1.43 through 6.1.*Not affected
6.4.8 through 6.4.*Not affected
6.5 and laterNot affected

References

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