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Fencer Vulns
high 7.8

CVE-2026-43500 in the critical feed json

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

published 2026-05-11 5 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-29037

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
94.1%
EPSS 94.1% chance of exploitation in 30 days, percentile 99.8%
public exploits
3
Metasploit, Exploit-DB

Summary

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

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec().

Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

Patch / fix

  • Linux Linux 6.6.140, 6.12.88, 6.18.29, 7.0.6, 7.1
  • linux Debian 12 6.1.170-3
  • linux Debian 13 6.12.86-1
  • linux Debian 14 7.0.4-1

debian advisories DEBIAN-CVE-2026-43500

  • linux Ubuntu 22.04 LTS 5.15.0-181.191
  • linux Ubuntu 24.04 LTS 6.8.0-124.124
  • linux Ubuntu 25.10 6.17.0-35.35
  • linux Ubuntu 26.04 LTS 7.0.0-22.22
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1109.116
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1057.60
  • linux-aws Ubuntu 25.10 6.17.0-1017.17
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1006.6

ubuntu advisories UBUNTU-CVE-2026-43500

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-syms Linux Micro Extras 6.2 6.12.0-160000.30.1
  • kernel-obs-build Linux Micro Extras 6.2 6.12.0-160000.30.1

suse advisories SUSE-SU-2026:21594-1

  • kernel-source openSUSE Tumbleweed 7.0.7-1.1

opensuse advisories openSUSE-SU-2026:10793-1

  • kernel AlmaLinux 10 6.12.0-211.40.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.40.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.40.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.40.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.40.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.40.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.40.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.40.1.el10_2

almalinux advisories ALSA-2026:47017

  • kernel Azure Linux 3.0 6.6.141.1-1

azure linux advisories AZL-86366

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43500 updated cvss 7.8

kernel: "Dirty Frag" RxRPC variant is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel, libkrun Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-225-04 updated cvss 7.8

Hitachi Energy APM Edge Product

  • Hitachi Energy APM Edge vers:APM_Edge/<=6.10
    affected: mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Timeline

  1. First public exploit (Metasploit exploit/linux/local/cve_2026_43500_dirty_frag)
  2. Published

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

94.12% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.