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Fencer Vulns
critical 9.8

CVE-2026-64530 in the critical feed json

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

published 2026-07-26 3 mo ago modified 2026-11-03 5 d ago also EUVD-2026-49051

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again.

tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.

tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct

(with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream)

Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.

Patch / fix

  • Linux Linux 5.15.212, 6.1.178, 6.6.145, 6.8, 6.12.97, 6.18.40, 7.1.5, 7.2
  • linux Debian 12 6.1.180-1
  • linux Debian 13 6.12.100-1
  • linux Debian 14 7.1.5-1
  • linux-6.12 Debian 12 6.12.100-1~deb12u1

debian advisories DEBIAN-CVE-2026-64530

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-34.34
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1013.13
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79

ubuntu advisories UBUNTU-CVE-2026-64530

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 enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • rv enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • perf enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • rtla enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • libperf enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • kernel-64k enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • kernel-core enterprise linux nvidia 10 6.12.0-231.19.el10nv
  • kernel-tools enterprise linux nvidia 10 6.12.0-231.19.el10nv

red hat advisories RHSA-2026:67277RHSA-2026:55761RHSA-2026:56225RHSA-2026:56224RHSA-2026:55837RHSA-2026:55762

  • kernel-default SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Live Patching 15 SP6 +1 more 6.4.0-150600.23.130.1
  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.182.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.182.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.182.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.182.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.182.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.182.1.150500.6.85.2
  • kernel-livepatch-MICRO-6-0_Update_21 Linux Micro 6.1, Linux Micro 6.0 5-1.1

suse advisories SUSE-SU-2026:3602-1SUSE-SU-2026:4172-1SUSE-SU-2026:3595-1SUSE-SU-2026:23483-1SUSE-SU-2026:23484-1SUSE-SU-2026:23485-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1openSUSE-SU-2026:11476-1

  • kernel AlmaLinux 10 6.12.0-211.42.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.42.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.42.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.42.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.42.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.42.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.42.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.42.1.el10_2

almalinux advisories ALSA-2026:49211ALSA-2026:49212ALSA-2026:49213ALSA-2026:49214

  • kernel-rt Rocky Linux 8 4.18.0-553.150.1.rt7.491.el8_10
  • kernel Rocky Linux 8 4.18.0-553.150.1.el8_10
  • kernel Rocky Linux 10 6.12.0-211.42.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.33.1.el9_8

rocky linux advisories RLSA-2026:49213RLSA-2026:49214RLSA-2026:49211RLSA-2026:49212

  • kernel Azure Linux 3.0 6.6.145.2-1

azure linux advisories AZL-93957

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-2026-64530 updated cvss 7.8

kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle

  • Red Hat NVIDIA for RHEL 10 rv 6.12.0-231.19.el10nv, perf 6.12.0-231.19.el10nv, rtla 6.12.0-231.19.el10nv, kernel 6.12.0-231.19.el10nv, libperf 6.12.0-231.19.el10nv, kernel-64k 6.12.0-231.19.el10nv, +28 more
    fixed: vendor fix RHSA-2026:67277
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.33.1.el9_8, perf 5.14.0-687.33.1.el9_8, rtla 5.14.0-687.33.1.el9_8, python3-perf 5.14.0-687.33.1.el9_8, kernel-devel-matched 5.14.0-687.33.1.el9_8, kernel-64k-devel-matched 5.14.0-687.33.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:49212
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.42.1.el10_2, perf 6.12.0-211.42.1.el10_2, rtla 6.12.0-211.42.1.el10_2, python3-perf 6.12.0-211.42.1.el10_2, kernel-devel-matched 6.12.0-211.42.1.el10_2, kernel-64k-devel-matched 6.12.0-211.42.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:49211
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.184.1.el9_2, rtla 5.14.0-284.184.1.el9_2, kernel-devel-matched 5.14.0-284.184.1.el9_2, kernel-64k-devel-matched 5.14.0-284.184.1.el9_2, kernel-debug-devel-matched 5.14.0-284.184.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.184.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:49032
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.93.1.el10_0, perf 6.12.0-55.93.1.el10_0, rtla 6.12.0-55.93.1.el10_0, python3-perf 6.12.0-55.93.1.el10_0, kernel-devel-matched 6.12.0-55.93.1.el10_0, kernel-64k-devel-matched 6.12.0-55.93.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:47620
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.150.1.el8_10, kernel 4.18.0-553.150.1.el8_10, bpftool 4.18.0-553.150.1.el8_10, kernel-core 4.18.0-553.150.1.el8_10, kernel-tools 4.18.0-553.150.1.el8_10, python3-perf 4.18.0-553.150.1.el8_10, +20 more
    fixed: vendor fix RHSA-2026:49214
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.33.1.el9_8, kernel-64k 5.14.0-687.33.1.el9_8, kernel-core 5.14.0-687.33.1.el9_8, kernel-tools 5.14.0-687.33.1.el9_8, kernel-modules 5.14.0-687.33.1.el9_8, kernel-64k-core 5.14.0-687.33.1.el9_8, +28 more
    fixed: vendor fix RHSA-2026:49212
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.42.1.el10_2, kernel-64k 6.12.0-211.42.1.el10_2, kernel-core 6.12.0-211.42.1.el10_2, kernel-tools 6.12.0-211.42.1.el10_2, kernel-modules 6.12.0-211.42.1.el10_2, kernel-64k-core 6.12.0-211.42.1.el10_2, +29 more
    fixed: vendor fix RHSA-2026:49211
show 22 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.204.1.el8_6, kernel 4.18.0-372.204.1.el8_6, bpftool 4.18.0-372.204.1.el8_6, kernel-core 4.18.0-372.204.1.el8_6, kernel-tools 4.18.0-372.204.1.el8_6, python3-perf 4.18.0-372.204.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:49033
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) kpatch-patch-4_18_0-477_130_1 1-9.el8_8, kpatch-patch-4_18_0-477_143_1 1-5.el8_8, kpatch-patch-4_18_0-477_97_1 1-16.el8_8, kpatch-patch-4_18_0-477_107_1 1-12.el8_8, kpatch-patch-4_18_0-477_120_1 1-11.el8_8
    fixed: vendor fix RHSA-2026:55761
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.184.1.el9_2, kernel 5.14.0-284.184.1.el9_2, kernel-64k 5.14.0-284.184.1.el9_2, kernel-core 5.14.0-284.184.1.el9_2, kernel-tools 5.14.0-284.184.1.el9_2, python3-perf 5.14.0-284.184.1.el9_2, +33 more
    fixed: vendor fix RHSA-2026:49032
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_126_1 1-7.el9_4, kpatch-patch-5_14_0-427_68_2 1-19.el9_4, kpatch-patch-5_14_0-427_84_1 1-14.el9_4, kpatch-patch-5_14_0-427_100_1 1-12.el9_4, kpatch-patch-5_14_0-427_113_1 1-10.el9_4
    fixed: vendor fix RHSA-2026:56224
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.93.1.el10_0, kernel-64k 6.12.0-55.93.1.el10_0, kernel-core 6.12.0-55.93.1.el10_0, kernel-tools 6.12.0-55.93.1.el10_0, kernel-modules 6.12.0-55.93.1.el10_0, kernel-64k-core 6.12.0-55.93.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:47620
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1 1-7.el9_6, kpatch-patch-5_14_0-570_17_1 1-22.el9_6, kpatch-patch-5_14_0-570_39_1 1-13.el9_6, kpatch-patch-5_14_0-570_66_1 1-12.el9_6, kpatch-patch-5_14_0-570_94_1 1-10.el9_6
    fixed: vendor fix RHSA-2026:56225
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.204.1.el8_6, kernel 4.18.0-372.204.1.el8_6, bpftool 4.18.0-372.204.1.el8_6, kernel-core 4.18.0-372.204.1.el8_6, kernel-tools 4.18.0-372.204.1.el8_6, python3-perf 4.18.0-372.204.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:49033
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.33.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.33.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.33.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.33.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.33.1.el9_8
    fixed: vendor fix RHSA-2026:49212
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.42.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.42.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.42.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.42.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.42.1.el10_2
    fixed: vendor fix RHSA-2026:49211
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.93.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.93.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.93.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.93.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.93.1.el10_0
    fixed: vendor fix RHSA-2026:47620
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.150.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.150.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.150.1.el8_10
    fixed: vendor fix RHSA-2026:49214
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-kvm 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-kvm 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-core 4.18.0-553.150.1.rt7.491.el8_10, +4 more
    fixed: vendor fix RHSA-2026:49213
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.33.1.el9_8, kernel-rt-64k 5.14.0-687.33.1.el9_8, kernel-rt-core 5.14.0-687.33.1.el9_8, kernel-rt-modules 5.14.0-687.33.1.el9_8, kernel-rt-64k-core 5.14.0-687.33.1.el9_8, kernel-rt-debug-core 5.14.0-687.33.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:49212
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.42.1.el10_2, kernel-rt-64k 6.12.0-211.42.1.el10_2, kernel-rt-core 6.12.0-211.42.1.el10_2, kernel-rt-modules 6.12.0-211.42.1.el10_2, kernel-rt-64k-core 6.12.0-211.42.1.el10_2, kernel-rt-debug-core 6.12.0-211.42.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:49211
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-core 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-modules 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-core 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-modules-core 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-modules 5.14.0-284.184.1.rt14.469.el9_2, +4 more
    fixed: vendor fix RHSA-2026:48222
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.93.1.el10_0, kernel-rt-64k 6.12.0-55.93.1.el10_0, kernel-rt-core 6.12.0-55.93.1.el10_0, kernel-rt-modules 6.12.0-55.93.1.el10_0, kernel-rt-64k-core 6.12.0-55.93.1.el10_0, kernel-rt-debug-core 6.12.0-55.93.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:47620
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.33.1.el9_8, kernel-rt-core 5.14.0-687.33.1.el9_8, kernel-rt-modules 5.14.0-687.33.1.el9_8, kernel-rt-debug-core 5.14.0-687.33.1.el9_8, kernel-rt-modules-core 5.14.0-687.33.1.el9_8, kernel-rt-debug-modules 5.14.0-687.33.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:49212
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.42.1.el10_2, kernel-rt-core 6.12.0-211.42.1.el10_2, kernel-rt-modules 6.12.0-211.42.1.el10_2, kernel-rt-debug-core 6.12.0-211.42.1.el10_2, kernel-rt-modules-core 6.12.0-211.42.1.el10_2, kernel-rt-debug-modules 6.12.0-211.42.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:49211
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-kvm 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-core 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-modules 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-kvm 5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-core 5.14.0-284.184.1.rt14.469.el9_2, +6 more
    fixed: vendor fix RHSA-2026:48222
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.93.1.el10_0, kernel-rt-kvm 6.12.0-55.93.1.el10_0, kernel-rt-core 6.12.0-55.93.1.el10_0, kernel-rt-modules 6.12.0-55.93.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.93.1.el10_0, kernel-rt-debug-core 6.12.0-55.93.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:47620
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules-extra 4.18.0-553.150.1.rt7.491.el8_10, +2 more
    fixed: vendor fix RHSA-2026:49213
  • 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
    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
yes
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

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.