HighFix available
netfilter: nft_set_rbtree: fix null deref on element insertion
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.181, 5.15.113, 6.1.30, 6.3.4
- CVEs
- CVE-2023-53566
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:29 UTC · Revision 1
Source evidence
netfilter: nft_set_rbtree: fix null deref on element insertion
core-osv · Original sourcePublished 4 Oct 2025, 15:17 UTC
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.
osv:CVE-2023-53566
Kernel
Fixed versions: 5.10.181, 5.15.113, 6.1.30, 6.3.4
Complete source record
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"modified": "2026-10-28T02:30:22.419274162Z",
"provider": "osv",
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"source_id": "core-osv",
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"published_at": "2025-10-04T15:17:08.598+00:00"
}