CVE-2026-43085
netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.
INFO
Published Date :
May 6, 2026, 10:16 a.m.
Last Modified :
June 1, 2026, 6:14 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Use nfnl_msg_put() to build NLMSG_DONE.
- Initialize nfgenmsg payload via nfnl_fill_hdr().
- Apply the Linux kernel patch.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43085.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43085 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43085
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43085 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43085 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.23:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.24 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.83 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.136 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.23.1 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 01, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072 Added Reference https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34d Added Reference https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 06, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers. Added Reference https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c Added Reference https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4 Added Reference https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b Added Reference https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c Added Reference https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a