CVE-2026-43450

HIGH EPSS 3.1%

Published May 8, 20261mo ago · Modified Jun 17, 20261w ago

7.1 CVSS 3.1

High

Published May 8, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

Description

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

CVSS Details

Base Score

7.1

Exploitability

1.8

Impact

5.2

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector Local

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality High

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

3.1% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 10

Vendor	Product	Version	Range
linux	linux_kernel	*	≥3.6 – <5.10.253
linux	linux_kernel	*	≥5.11 – <5.15.203
linux	linux_kernel	*	≥5.16 – <6.1.167
linux	linux_kernel	*	≥6.2 – <6.6.130
linux	linux_kernel	*	≥6.7 – <6.12.78
linux	linux_kernel	*	≥6.13 – <6.18.19
linux	linux_kernel	*	≥6.19 – <6.19.9
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any

References 8

git.kernel.org https://git.kernel.org/stable/c/05018cd9370f77bb18fbf6e15ff33c7a06f10b3c

Patch
git.kernel.org https://git.kernel.org/stable/c/0605e1985a95d4334a67869aee45a47e82301abf

Patch
git.kernel.org https://git.kernel.org/stable/c/3cc328ffc32ddb389cba7b78b6aa95d995c2876e

Patch
git.kernel.org https://git.kernel.org/stable/c/4a1f6ee69267a5f524102c028981410eeacfa3da

Patch
git.kernel.org https://git.kernel.org/stable/c/61b3a1f8621df1a5928118313f133996f6a786db

Patch
git.kernel.org https://git.kernel.org/stable/c/6dcee8496d53165b2d8a5909b3050b62ae71fe89

Patch
git.kernel.org https://git.kernel.org/stable/c/894c5780ddadd5fde0e16f66587918e6be1504c4

Patch
git.kernel.org https://git.kernel.org/stable/c/92441f6d9405a0c18d03f278b395e782f79a4a30

Patch

Remediation

git.kernel.org https://git.kernel.org/stable/c/05018cd9370f77bb18fbf6e15ff33c7a06f10b3c

Patch
git.kernel.org https://git.kernel.org/stable/c/0605e1985a95d4334a67869aee45a47e82301abf

Patch
git.kernel.org https://git.kernel.org/stable/c/3cc328ffc32ddb389cba7b78b6aa95d995c2876e

Patch
git.kernel.org https://git.kernel.org/stable/c/4a1f6ee69267a5f524102c028981410eeacfa3da

Patch
git.kernel.org https://git.kernel.org/stable/c/61b3a1f8621df1a5928118313f133996f6a786db

Patch
git.kernel.org https://git.kernel.org/stable/c/6dcee8496d53165b2d8a5909b3050b62ae71fe89

Patch
git.kernel.org https://git.kernel.org/stable/c/894c5780ddadd5fde0e16f66587918e6be1504c4

Patch
git.kernel.org https://git.kernel.org/stable/c/92441f6d9405a0c18d03f278b395e782f79a4a30

Patch