CVE-2023-53566

netfilter: nft_set_rbtree: fix null deref on element insertion

State: Published
Severity: 7.8 High
Published: Oct 4, 2025
Updated: Oct 15, 2026
Reserved: Oct 4, 2025

Description

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

netfilter: nft_set_rbtree: fix null deref on element insertion

There is no guarantee that rb_prev() will not return NULL in nft_rbtree_gc_elem():

general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] nft_add_set_elem+0x14b0/0x2990 nf_tables_newsetelem+0x528/0xb30

Furthermore, there is a possible use-after-free while iterating, 'node' can be free'd so we need to cache the next value to use.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7ab87a326f20c52ff4d9972052d085be951c704b to before b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56Affected 181859bdfb9734aca449512fccaee4cacce64aed to before 899aa5638568abf5d69de7a7bb95e4615157375bAffected 4aacf3d78424293e318c616016865380b37b9cc5 to before 3fa13203b6d90cc3a33af47b058739f92ab82eefAffected 2bf1435fa19d2c58054391b3bba40d5510a5758c to before ec5caa765f7f6960011c919c9aeb1467940421f6Affected 318cb24a4c3fce8140afaf84e4d45fcb76fb280b to before a836be60a3aabcedcd9c79f545d409ace1f20ba6Affected c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before a337706c1fb35aac3f26b48aca80421bdbe1d33aAffected c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before 61ae320a29b0540c16931816299eb86bf2b66c08Affected 5.10.166 to before 5.10.181Affected 5.15.91 to before 5.15.113Affected 6.1.9 to before 6.1.30Affected
LinuxLinux	6.2Affected before 6.2Not affected 5.10.181 through 5.10.Not affected 5.15.113 through 5.15.Not affected 6.1.30 through 6.1.Not affected 6.3.4 through 6.3.Not affected 6.4 and laterNot affected

Product

Versions

LinuxLinux

7ab87a326f20c52ff4d9972052d085be951c704b to before b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56Affected
181859bdfb9734aca449512fccaee4cacce64aed to before 899aa5638568abf5d69de7a7bb95e4615157375bAffected
4aacf3d78424293e318c616016865380b37b9cc5 to before 3fa13203b6d90cc3a33af47b058739f92ab82eefAffected
2bf1435fa19d2c58054391b3bba40d5510a5758c to before ec5caa765f7f6960011c919c9aeb1467940421f6Affected
318cb24a4c3fce8140afaf84e4d45fcb76fb280b to before a836be60a3aabcedcd9c79f545d409ace1f20ba6Affected
c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before a337706c1fb35aac3f26b48aca80421bdbe1d33aAffected
c9e6978e2725a7d4b6cd23b2facd3f11422c0643 to before 61ae320a29b0540c16931816299eb86bf2b66c08Affected
5.10.166 to before 5.10.181Affected
5.15.91 to before 5.15.113Affected
6.1.9 to before 6.1.30Affected

LinuxLinux

6.2Affected
before 6.2Not affected
5.10.181 through 5.10.*Not affected
5.15.113 through 5.15.*Not affected
6.1.30 through 6.1.*Not affected
6.3.4 through 6.3.*Not affected
6.4 and laterNot affected

References

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