CVE-2023-53566

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.

Score

CVSS 3.1 7.8 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-10-04

Last modified

2026-10-15

Weaknesses

CWE-476

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56
• https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b
• https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef
• https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
• https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6
• https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a
• https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08