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High · 7.8 Public exploit CVE-2026-80521 EUVD-2026-66587GHSA-g8mr-r59r-2xmq

af_unix: Unlink scc_entry in unix_del_edge().

Published Aug 26, 2026 · Updated Oct 3, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-6.12 Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-7.0 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-7.0 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.17 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fde-7.0 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-7.0 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-7.0 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-7.0 Package: linux-nvidia-bos Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oem-7.0 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-oracle-7.0 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-riscv-7.0 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

af_unix: Unlink scc_entry in unix_del_edge().

Kyle Zeng reported that GC could free a dead SCC partially.

The scenario is as follows:

1) Create two SCCs:

X -. A <-> B
^--'

2) Run the following concurrently:

2-1) send() sk-B to sk-B from sk-X
2-2) close() both A and B

At 2-1), there is a small window where unix_add_edges()
publishes a new edge (B <-> B) to GC but its skb is not queued
by skb_queue_tail().

If 2-2) completes before skb_queue_tail() and GC is triggered,
it judges A <-> B as dead, but B is not freed because GC cannot
collect the not-yet-queued skb holding the B <-> B edge.

X -. A <-> B -. This edge is visible
^--' ^..' but skb is not

This itself is not a problem since the next GC run will judge
B as dead as well and free it finally.

X -. A <.> B -.
^--' ^--'

However, X's SCC forces the next GC to call unix_walk_scc_fast(),
and it iterates over A through B's scc_entry.

Let's unlink scc_entry before freeing the vertex in unix_del_edge().

Affected products

VendorProductAffectedFixed
Linux Linux 6.1.141 – < 6.1.189, 6.6.93 – < 6.6.158, 6.10 6.1.189

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 7.1.10-1 —
Debian 13 linux 6.12.111-1 —
Debian 12 linux 6.1.190-1 —
Debian 12 linux-6.12 6.12.111-1~deb12u1 —
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1036.41 —
Ubuntu 26.04 LTS linux 7.0.0-42.42 USN-8959-1
Ubuntu 26.04 LTS linux-aws 7.0.0-1016.17 USN-8959-1
Ubuntu 26.04 LTS linux-azure 7.0.0-1020.21 USN-9019-1
Ubuntu 26.04 LTS linux-azure-fde 7.0.0-1019.19 USN-9020-1
Ubuntu 26.04 LTS linux-gcp 7.0.0-1016.18 USN-8959-1
Ubuntu 26.04 LTS linux-gke 7.0.0-1010.11 USN-9020-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1017.17 USN-8960-1, USN-8959-1
Ubuntu 26.04 LTS linux-nvidia +1 No fix yet —
Ubuntu 26.04 LTS linux-oracle 7.0.0-1015.16 USN-8959-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1023.23 USN-9021-1
Ubuntu 26.04 LTS linux-realtime 7.0.0-43.43.1 USN-9020-1
Ubuntu 26.04 LTS linux-riscv 7.0.0-42.42.1 —
Ubuntu 24.04 LTS linux 6.8.0-149.149 USN-9022-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1069.74 USN-9022-1
Ubuntu 24.04 LTS linux-aws-7.0 7.0.0-1017.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1073.82 USN-9022-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1071.78 USN-9039-1
Ubuntu 24.04 LTS linux-azure-fde-7.0 7.0.0-1019.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-gcp 6.8.0-1073.81 USN-9022-1
Ubuntu 24.04 LTS linux-gcp-7.0 7.0.0-1017.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1068.77 USN-9022-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1053.57 USN-9023-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-42.42~24.04.1 USN-8959-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1069.70 USN-9022-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-149.149.1 USN-9022-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1067.70 USN-9024-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1067.70.1 USN-9040-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1036.39 USN-8886-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1067.71 USN-9022-1
Ubuntu 24.04 LTS linux-oracle-7.0 7.0.0-1016.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-raspi 6.8.0-1068.72 USN-9025-1
Ubuntu 24.04 LTS linux-riscv +31 No fix yet —
Ubuntu 24.04 LTS linux-riscv-7.0 7.0.0-42.42.1~24.04.1 —
Ubuntu 24.04 LTS linux-vmware 6.8.0-1010.10 USN-9022-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1069.74~22.04.1 USN-9024-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1073.82~22.04.1 USN-9026-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1071.78~22.04.1 USN-9026-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1073.81~22.04.1 USN-9024-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-149.149~22.04.1 USN-9066-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1069.70~22.04.1 USN-9024-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-149.149.1~22.04.1 USN-9024-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1067.71~22.04.1 USN-9025-1
Ubuntu 22.04 LTS linux-riscv +33 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2056.58 USN-9025-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1064.65 USN-9023-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 +1 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1064.65~22.04.1 USN-9024-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1069.74+fips1 USN-9023-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1073.82+fips1 USN-9022-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1073.81+fips1 USN-9023-1
ReleasePackageFixed inAdvisory
RHEL 10 rv +77 6.12.0-211.65.1.el10_2 RHSA-2026:98608, RHSA-2026:81406
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Shadow Migration Toolkit 10 kernel-modules-internal 6.12.0-211.65.1.el10_2 RHSA-2026:81406
RHEL 10.0 EUS rv +77 6.12.0-55.109.1.el10_0 RHSA-2026:77634

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 rv +74 6.12.0-211.65.1.el10_2 ALSA-2026:81406

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 kernel 6.12.0-211.65.1.el10_2 RLSA-2026:81406
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +8 6.12.0-160000.39.1 SUSE-SU-2026:24235-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24235-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_0 21-160000.4.3 SUSE-SU-2026:24672-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_1 19-160000.1.1 SUSE-SU-2026:24678-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_12 +1 8-160000.1.1 SUSE-SU-2026:24679-1, SUSE-SU-2026:24664-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_13 8-160000.1.2 SUSE-SU-2026:24668-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_15 6-160000.1.1 SUSE-SU-2026:24681-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_16 5-160000.1.1 SUSE-SU-2026:24666-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_17 2-160000.1.1 SUSE-SU-2026:24673-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_2 17-160000.1.1 SUSE-SU-2026:24671-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_3 16-160000.1.1 SUSE-SU-2026:24677-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_4 15-160000.1.1 SUSE-SU-2026:24670-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_5 14-160000.1.1 SUSE-SU-2026:24676-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_6 13-160000.1.1 SUSE-SU-2026:24667-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_7 12-160000.1.1 SUSE-SU-2026:24680-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_8 11-160000.1.1 SUSE-SU-2026:24675-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_9 +2 10-160000.1.1 SUSE-SU-2026:24674-1, SUSE-SU-2026:24669-1, SUSE-SU-2026:24663-1
SLES 16.0 kernel-64kb +8 6.12.0-160000.39.1 SUSE-SU-2026:24235-1, SUSE-SU-2026:24197-1
SLES 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24235-1
SLES 16.0 kernel-livepatch-SLE16_Update_0 21-160000.4.3 SUSE-SU-2026:24672-1
SLES 16.0 kernel-livepatch-SLE16_Update_1 19-160000.1.1 SUSE-SU-2026:24678-1
SLES 16.0 kernel-livepatch-SLE16_Update_12 +1 8-160000.1.1 SUSE-SU-2026:24679-1, SUSE-SU-2026:24664-1
SLES 16.0 kernel-livepatch-SLE16_Update_13 8-160000.1.2 SUSE-SU-2026:24668-1
SLES 16.0 kernel-livepatch-SLE16_Update_15 6-160000.1.1 SUSE-SU-2026:24681-1
SLES 16.0 kernel-livepatch-SLE16_Update_16 5-160000.1.1 SUSE-SU-2026:24666-1
SLES 16.0 kernel-livepatch-SLE16_Update_17 2-160000.1.1 SUSE-SU-2026:24673-1
SLES 16.0 kernel-livepatch-SLE16_Update_2 17-160000.1.1 SUSE-SU-2026:24671-1
SLES 16.0 kernel-livepatch-SLE16_Update_3 16-160000.1.1 SUSE-SU-2026:24677-1
SLES 16.0 kernel-livepatch-SLE16_Update_4 15-160000.1.1 SUSE-SU-2026:24670-1
SLES 16.0 kernel-livepatch-SLE16_Update_5 14-160000.1.1 SUSE-SU-2026:24676-1
SLES 16.0 kernel-livepatch-SLE16_Update_6 13-160000.1.1 SUSE-SU-2026:24667-1
SLES 16.0 kernel-livepatch-SLE16_Update_7 12-160000.1.1 SUSE-SU-2026:24680-1
SLES 16.0 kernel-livepatch-SLE16_Update_8 11-160000.1.1 SUSE-SU-2026:24675-1
SLES 16.0 kernel-livepatch-SLE16_Update_9 +2 10-160000.1.1 SUSE-SU-2026:24674-1, SUSE-SU-2026:24669-1, SUSE-SU-2026:24663-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24184-1
SLE Micro 6.2 kernel-livepatch-SLE16-RT_Update_0 19-160000.3.4 SUSE-SU-2026:24538-1
SLE Micro 6.2 kernel-livepatch-SLE16-RT_Update_1 18-160000.1.1 SUSE-SU-2026:24537-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_0 21-160000.4.3 SUSE-SU-2026:24630-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_1 19-160000.1.1 SUSE-SU-2026:24636-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_12 +4 8-160000.1.1 SUSE-SU-2026:24637-1, SUSE-SU-2026:24621-1, SUSE-SU-2026:24526-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_13 8-160000.1.2 SUSE-SU-2026:24626-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_15 +1 6-160000.1.1 SUSE-SU-2026:24639-1, SUSE-SU-2026:24523-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_16 +1 5-160000.1.1 SUSE-SU-2026:24623-1, SUSE-SU-2026:24522-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_17 +1 2-160000.1.1 SUSE-SU-2026:24631-1, SUSE-SU-2026:24521-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_2 17-160000.1.1 SUSE-SU-2026:24629-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_3 +1 16-160000.1.1 SUSE-SU-2026:24635-1, SUSE-SU-2026:24536-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_4 +2 15-160000.1.1 SUSE-SU-2026:24628-1, SUSE-SU-2026:24535-1, SUSE-SU-2026:24533-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_5 +1 14-160000.1.1 SUSE-SU-2026:24634-1, SUSE-SU-2026:24534-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_6 +1 13-160000.1.1 SUSE-SU-2026:24624-1, SUSE-SU-2026:24532-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_7 +1 12-160000.1.1 SUSE-SU-2026:24638-1, SUSE-SU-2026:24531-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_8 +1 11-160000.1.1 SUSE-SU-2026:24633-1, SUSE-SU-2026:24530-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_9 +5 10-160000.1.1 SUSE-SU-2026:24632-1, SUSE-SU-2026:24627-1, SUSE-SU-2026:24620-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.39.1 SUSE-SU-2026:24184-1, SUSE-SU-2026:24179-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.1 kernel-default-base 6.12.0-160100.9.1.160100.3.14 openSUSE-SU-2026:22309-1
openSUSE Leap 16.1 kernel-nvidia64kb +2 6.12.0-160100.6.1 openSUSE-SU-2026:22313-1
openSUSE Leap 16.1 kernel-rt +11 6.12.0-160100.9.1 openSUSE-SU-2026:22309-1
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.25 openSUSE-SU-2026:22091-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.39.1 openSUSE-SU-2026:22091-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.1.188-233.386 +2 1:1.0-0.amzn2023 ALAS2023-2026-3148, ALAS2023-2026-3147, ALAS2023-2026-3146
Amazon Linux 2023 perf +11 1:6.1.188-233.386.amzn2023 ALAS2023-2026-3146
Amazon Linux 2023 perf6.12 +11 1:6.12.110-135.202.amzn2023 ALAS2023-2026-3147
Amazon Linux 2023 perf6.18 +12 1:6.18.51-120.163.amzn2023 ALAS2023-2026-3148

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel No fix yet —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 rv +29 6.12.0-211.65.1.el10_2 ELSA-2026-81406
Oracle Linux 9 kernel-uek +34 6.12.0-207.111.5.1.el10uek ELSA-2026-500374

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 50

References