high 7.8

CVE-2024-26739 json

net/sched: act_mirred: don't override retval if we already lost the skb

published 2024-04-03 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-24001

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

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

If we're redirecting the skb, and haven't called tcf_mirred_forward(), yet, we need to tell the core to drop the skb by setting the retcode to SHOT. If we have called tcf_mirred_forward(), however, the skb is out of our hands and returning SHOT will lead to UaF.

Move the retval override to the error path which actually need it.

Patch / fix

fixed in 1 distros 6 links 6

Linux Linux 5.10.238, 5.15.182, 6.1.136, 6.6.19, 6.7.7, 6.8

debian ubuntu red hat suse almalinux azure linux

linux Debian 12 6.1.137-1
linux Debian 14, Debian 13 6.7.7-1

debian advisories DEBIAN-CVE-2024-26739

linux Ubuntu 22.04 LTS 5.15.0-144.157
linux-aws Ubuntu 22.04 LTS 5.15.0-1088.95
linux-gcp Ubuntu 22.04 LTS 5.15.0-1087.96
linux-gke Ubuntu 22.04 LTS 5.15.0-1085.91
linux-ibm Ubuntu 22.04 LTS 5.15.0-1080.83
linux-kvm Ubuntu 22.04 LTS 5.15.0-1084.89
linux-azure Ubuntu 22.04 LTS 5.15.0-1094.103
linux-gkeop Ubuntu 22.04 LTS 5.15.0-1070.78

ubuntu advisories UBUNTU-CVE-2024-26739

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 RHEL 9 5.14.0-427.37.1.el9_4
rv RHEL 9 5.14.0-427.37.1.el9_4
perf RHEL 9 5.14.0-427.37.1.el9_4
rtla RHEL 9 5.14.0-427.37.1.el9_4
bpftool RHEL 9 7.3.0-427.37.1.el9_4
libperf RHEL 9 5.14.0-427.37.1.el9_4
kernel-rt RHEL 9 5.14.0-427.37.1.el9_4
kernel-64k RHEL 9 5.14.0-427.37.1.el9_4

red hat advisories RHSA-2024:4823 RHSA-2024:4831 RHSA-2024:6997

kernel-rt Linux Micro 6.0 6.4.0-9.1
kernel-source-rt Linux Micro 6.0 6.4.0-9.1
kernel-source Linux Micro 6.0 6.4.0-18.1
kernel-default Linux Micro 6.0 6.4.0-18.1
kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1
kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1

suse advisories SUSE-SU-2025:20028-1 SUSE-SU-2025:20008-1 SUSE-SU-2024:2973-1 SUSE-SU-2024:2203-1 SUSE-SU-2024:2190-1 SUSE-SU-2024:2189-1

kernel AlmaLinux 9 5.14.0-427.37.1.el9_4
rv AlmaLinux 9 5.14.0-427.37.1.el9_4
perf AlmaLinux 9 5.14.0-427.37.1.el9_4
rtla AlmaLinux 9 5.14.0-427.37.1.el9_4
bpftool AlmaLinux 9 7.3.0-427.37.1.el9_4
libperf AlmaLinux 9 5.14.0-427.37.1.el9_4
kernel-rt AlmaLinux 9 5.14.0-427.37.1.el9_4
kernel-64k AlmaLinux 9 5.14.0-427.37.1.el9_4

almalinux advisories ALSA-2024:6997

kernel CBL-Mariner 2.0 5.15.182.1-1

azure linux advisories AZL-54954

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-2024-26739 updated 2026-11-05 cvss 5.5

kernel: net/sched: act_mirred: don't override retval if we already lost the skb

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
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
affected: no fix available
Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.75.1.el9_2
fixed: vendor fix RHSA-2024:4823
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.37.1.el9_4, perf 5.14.0-427.37.1.el9_4, rtla 5.14.0-427.37.1.el9_4, kernel-devel-matched 5.14.0-427.37.1.el9_4, kernel-64k-devel-matched 5.14.0-427.37.1.el9_4, kernel-debug-devel-matched 5.14.0-427.37.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:6997
Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.75.1.el9_2, rtla 5.14.0-284.75.1.el9_2, kernel-devel-matched 5.14.0-284.75.1.el9_2, kernel-64k-devel-matched 5.14.0-284.75.1.el9_2, kernel-debug-devel-matched 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, +5 more
fixed: vendor fix RHSA-2024:4823
Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.37.1.el9_4, kernel 5.14.0-427.37.1.el9_4, kernel-64k 5.14.0-427.37.1.el9_4, kernel-core 5.14.0-427.37.1.el9_4, kernel-tools 5.14.0-427.37.1.el9_4, python3-perf 5.14.0-427.37.1.el9_4, +28 more
fixed: vendor fix RHSA-2024:6997
Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.75.1.el9_2, kernel 5.14.0-284.75.1.el9_2, kernel-64k 5.14.0-284.75.1.el9_2, kernel-core 5.14.0-284.75.1.el9_2, kernel-tools 5.14.0-284.75.1.el9_2, python3-perf 5.14.0-284.75.1.el9_2, +28 more
fixed: vendor fix RHSA-2024:4823
Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.37.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.37.1.el9_4, kernel-rt-kvm 5.14.0-427.37.1.el9_4, kernel-rt-core 5.14.0-427.37.1.el9_4, kernel-rt-modules 5.14.0-427.37.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.37.1.el9_4, kernel-rt-debug-core 5.14.0-427.37.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:6997

show 3 more

Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-modules 5.14.0-284.75.1.rt14.360.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, +6 more
fixed: vendor fix RHSA-2024:4831
Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.37.1.el9_4, kernel-rt-core 5.14.0-427.37.1.el9_4, kernel-rt-modules 5.14.0-427.37.1.el9_4, kernel-rt-debug-core 5.14.0-427.37.1.el9_4, kernel-rt-modules-core 5.14.0-427.37.1.el9_4, kernel-rt-debug-modules 5.14.0-427.37.1.el9_4, +4 more
fixed: vendor fix RHSA-2024:6997
Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.75.1.el9_2
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 SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-10)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

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
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

Classification

Weakness

CWE-416 Use After Free

Technology feeds

Linux kernel rss critical rss

References

git.kernel.org /stable/c/0117fe0a4615a7c8d30d6ebcbf87332fbe63e6fd
patch
git.kernel.org /stable/c/9d3ef89b6a5e9f2e940de2cef3d543be0be8dec5
patch
git.kernel.org /stable/c/e873e8f7d03a2ee5b77fb1a305c782fed98e2754
patch
git.kernel.org /stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d
patch
git.kernel.org /stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7
patch
git.kernel.org /stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210
patch
lists.debian.org /debian-lts-announce/2025/10/msg00007.html
mailing-list, third-party-advisory
lists.debian.org /debian-lts-announce/2025/05/msg00045.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2024-26739
NVD CVE-2024-26739

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.

Summary