CVE-2023-53566
published 2025-10-04CVE-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…
PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.14%
3.8th percentile
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.
Affected
26 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.37-1 (bookworm) | linux 6.1.37-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 181859bdfb9734aca449512fccaee4cacce64aed < 899aa5638568abf5d69de7a7bb95e4615157375b | 899aa5638568abf5d69de7a7bb95e4615157375b |
| linux | linux | >= 2bf1435fa19d2c58054391b3bba40d5510a5758c < ec5caa765f7f6960011c919c9aeb1467940421f6 | ec5caa765f7f6960011c919c9aeb1467940421f6 |
| linux | linux | >= 318cb24a4c3fce8140afaf84e4d45fcb76fb280b < a836be60a3aabcedcd9c79f545d409ace1f20ba6 | a836be60a3aabcedcd9c79f545d409ace1f20ba6 |
| linux | linux | >= 4aacf3d78424293e318c616016865380b37b9cc5 < 3fa13203b6d90cc3a33af47b058739f92ab82eef | 3fa13203b6d90cc3a33af47b058739f92ab82eef |
| linux | linux | >= 5.10.166 < 5.10.181 | 5.10.181 |
| linux | linux | >= 5.15.91 < 5.15.113 | 5.15.113 |
| linux | linux | >= 6.1.9 < 6.1.30 | 6.1.30 |
| linux | linux | >= 7ab87a326f20c52ff4d9972052d085be951c704b < b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56 | b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56 |
| linux | linux | >= c9e6978e2725a7d4b6cd23b2facd3f11422c0643 < a337706c1fb35aac3f26b48aca80421bdbe1d33a | a337706c1fb35aac3f26b48aca80421bdbe1d33a |
| linux | linux | >= c9e6978e2725a7d4b6cd23b2facd3f11422c0643 < 61ae320a29b0540c16931816299eb86bf2b66c08 | 61ae320a29b0540c16931816299eb86bf2b66c08 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.191-1 | 5.10.191-1 |
| linux | linux_kernel | >= 0 < 6.1.37-1 | 6.1.37-1 |
| linux | linux_kernel | >= 0 < 6.3.7-1 | 6.3.7-1 |
| linux | linux_kernel | >= 0 < 6.3.7-1 | 6.3.7-1 |
| linux | linux_kernel | >= 5.10.166 < 5.10.181 | 5.10.181 |
| linux | linux_kernel | >= 5.15.91 < 5.15.113 | 5.15.113 |
| linux | linux_kernel | >= 6.1.9 < 6.1.30 | 6.1.30 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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Red Hat
kernel: netfilter: nft_set_rbtree: fix null deref on element insertion
vendor_redhat·2025-10-04·CVSS 5.5
CVE-2023-53566 [MEDIUM] CWE-476 kernel: netfilter: nft_set_rbtree: fix null deref on element insertion
kernel: netfilter: nft_set_rbtree: fix null deref on element insertion
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.
A flaw was found in the Netfilter subsystem in the Linux kernel. A NULL pointer dereference and a use-after-free issue can be triggered due
Debian
CVE-2023-53566: linux - In the Linux kernel, the following vulnerability has been resolved: netfilter: ...
vendor_debian·2023·CVSS 5.5
CVE-2023-53566 [MEDIUM] CVE-2023-53566: linux - In the Linux kernel, the following vulnerability has been resolved: netfilter: ...
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.
Scope: local
bookworm: resolved (fixed in 6.1.37-1)
bullseye: resolved (fixed in 5.10.191-1)
forky: resolved (fixed in 6.3.7-1)
sid: resolved (fixed in 6.3.7-1)
trixie: resolved (fixed in 6.3.7-1)
GHSA
GHSA-pcw3-hvmm-479h: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_rbtree: fix null deref on element insertion
There is no guara
ghsa_unreviewed·2025-10-04
CVE-2023-53566 [MEDIUM] CWE-476 GHSA-pcw3-hvmm-479h: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_rbtree: fix null deref on element insertion
There is no guara
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: In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix null deref on element insertion There is no guarant
osv·2025-10-04·CVSS 5.5
CVE-2023-53566 [MEDIUM] 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 guarant
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.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eefhttps://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375bhttps://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33ahttps://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
2025-10-04
Published