CVE-2026-43450

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Source
https://cve.org/CVERecord?id=CVE-2026-43450
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43450.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43450
Downstream
Related
Published
2026-05-08T14:22:15Z
Modified
2026-09-05T11:10:53Z
Summary
netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()
Details

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

netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()

nfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label inside the for loop body. When the "last" helper saved in cb->args[1] is deleted between dump rounds, every entry fails the (cur != last) check, so cb->args[1] is never cleared. The for loop finishes with cb->args[0] == nf_ct_helper_hsize, and the 'goto restart' jumps back into the loop body bypassing the bounds check, causing an 8-byte out-of-bounds read on nf_ct_helper_hash[nf_ct_helper_hsize].

The 'goto restart' block was meant to re-traverse the current bucket when "last" is no longer found, but it was placed after the for loop instead of inside it. Move the block into the for loop body so that the restart only occurs while cb->args[0] is still within bounds.

BUG: KASAN: slab-out-of-bounds in nfnl_cthelper_dump_table+0x9f/0x1b0 Read of size 8 at addr ffff888104ca3000 by task poc_cthelper/131 Call Trace: nfnl_cthelper_dump_table+0x9f/0x1b0 netlink_dump+0x333/0x880 netlink_recvmsg+0x3e2/0x4b0 sock_recvmsg+0xde/0xf0 __sys_recvfrom+0x150/0x200 __x64_sys_recvfrom+0x76/0x90 do_syscall_64+0xc3/0x6e0

Allocated by task 1: __kvmalloc_node_noprof+0x21b/0x700 nf_ct_alloc_hashtable+0x65/0xd0 nf_conntrack_helper_init+0x21/0x60 nf_conntrack_init_start+0x18d/0x300 nf_conntrack_standalone_init+0x12/0xc0

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43450.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
12f7a505331e6b2754684b509f2ac8f0011ce644
Fixed
0605e1985a95d4334a67869aee45a47e82301abf
Fixed
92441f6d9405a0c18d03f278b395e782f79a4a30
Fixed
3cc328ffc32ddb389cba7b78b6aa95d995c2876e
Fixed
4a1f6ee69267a5f524102c028981410eeacfa3da
Fixed
894c5780ddadd5fde0e16f66587918e6be1504c4
Fixed
05018cd9370f77bb18fbf6e15ff33c7a06f10b3c
Fixed
61b3a1f8621df1a5928118313f133996f6a786db
Fixed
6dcee8496d53165b2d8a5909b3050b62ae71fe89

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43450.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.6.0
Fixed
5.10.253
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.203
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.167
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.130
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.78
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.19
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43450.json"