5.5

CVE-2026-43085: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-43085DEBIAN-CVE-2026-43085
Published 06-05-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-43085 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 38 · Related 38
OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22521-1SUSE-SU-2026:22522-1SUSE-SU-2026:22665-1SUSE-SU-2026:22666-1SUSE-SU-2026:22742-1

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.05 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 296f18e1c3a87c915a92ed27832d5040a22d1072 | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 9e2182865de781c41ab16b7985e9d26dcefea867 | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 57cc509d82b46150a11dcecc8b25eaa177eda34d | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 368c22aea490f6f50df831b4f9e3623787686c5b | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < d1399632ba255d2e02c757af5d9f5d9279ce168c | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < d552bcfca323d175664d7444989b04f55666978a | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c | ≥ 29c5d4afba51c71cfeadd3f74f3c42e064483fb0, < 1f3083aec8836213da441270cdb1ab612dd82cf4 | 2.6.23
  • linux_kernel≥ 2.6.23.1, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.136 | ≥ 6.7, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 6.19, < 6.19.14 | 2.6.23 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.14-1

3 vendors · 160 products

References

42 links
Show all 42 references