Description
A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.
When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.
We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Kernel | 3.18 – < 6.5 | 6.5 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.4.11-1 | — |
| Debian 13 | linux | 6.4.11-1 | — |
| Debian 12 | linux | 6.1.52-1 | DSA-5492-1 |
| Debian 10 | linux | 4.19.304-1 | DLA-3710-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1024.26 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-84.93 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1045.50 | — |
| Ubuntu 22.04 LTS | linux-aws-6.2 +1 | 6.2.0-1012.12~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1047.54 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1047.54.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1042.50 | — |
| Ubuntu 22.04 LTS | linux-gcp-6.2 | 6.2.0-1014.14~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1042.47 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1028.33 | — |
| Ubuntu 22.04 LTS | linux-hwe-6.2 | 6.2.0-33.33~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1038.41 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1040.46 | — |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1013.13~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1033.33 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1018.18 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1005.5 | — |
| Ubuntu 22.04 LTS | linux-oem-6.1 | 6.1.0-1021.21 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1044.50 | — |
| Ubuntu 22.04 LTS | linux-riscv +13 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-163.180 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1110.119 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1045.50~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1116.123 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1047.54~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1071.77 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1113.122 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1042.50~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1077.81 | — |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1028.33~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-84.93~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1057.62 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1038.41~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1040.46~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1022.23 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1099.105 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1018.18~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1109.118 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1044.50~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1094.105 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1041.45~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1030.34 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1039.41 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1046.52 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1110.119+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1116.123+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1085.94 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1113.122+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2100.106 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2079.85 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1116.127 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2063.68 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1093.100 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-218.229 | — |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1161.174 | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1110.119~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1170.185 | — |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1116.123~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1155.172 | — |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1113.122~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-163.180~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1057.62~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1145.150 | — |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1124.135 | — |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1109.118~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1094.105~18.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-245.279 | — |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1161.176 | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1161.174~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1170.185~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1155.172~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-218.229~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1124.134 | — |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1124.135~16.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1123.129 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1170.185~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-245.279~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.2.0-362.8.1.el9_3 | RHSA-2023:6583 |
| RHEL 9 | rv +64 | 5.14.0-362.8.1.el9_3 | RHSA-2023:6583 |
| RHEL 8 | kernel-rt +12 | 4.18.0-513.5.1.rt7.307.el8_9 | RHSA-2023:6901 |
| RHEL 8 | perf +26 | 4.18.0-513.5.1.el8_9 | RHSA-2023:7077 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.105.1.rt56.1256.el7 | RHSA-2023:7424 |
| RHEL 7 | kpatch-patch-3_10_0-1160_102_1 | 1-1.el7 | RHSA-2023:7419 |
| RHEL 7 | kpatch-patch-3_10_0-1160_90_1 +1 | 1-4.el7 | RHSA-2023:7419 |
| RHEL 7 | kpatch-patch-3_10_0-1160_95_1 | 1-3.el7 | RHSA-2023:7419 |
| RHEL 7 | kpatch-patch-3_10_0-1160_99_1 | 1-2.el7 | RHSA-2023:7419 |
| RHEL 7 | perf +18 | 3.10.0-1160.105.1.el7 | RHSA-2023:7423 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | bpftool | 7.0.0-284.40.1.el9_2 | RHSA-2023:7370 |
| RHEL 9.2 EUS | kernel-rt +14 | 5.14.0-284.40.1.rt14.325.el9_2 | RHSA-2023:7379 |
| RHEL 9.2 EUS | kpatch-patch-5_14_0-284_11_1 | 1-6.el9_2 | RHSA-2023:7418 |
| RHEL 9.2 EUS | kpatch-patch-5_14_0-284_18_1 | 1-5.el9_2 | RHSA-2023:7418 |
| RHEL 9.2 EUS | kpatch-patch-5_14_0-284_25_1 | 1-4.el9_2 | RHSA-2023:7418 |
| RHEL 9.2 EUS | kpatch-patch-5_14_0-284_30_1 | 1-1.el9_2 | RHSA-2023:7418 |
| RHEL 9.2 EUS | perf +48 | 5.14.0-284.40.1.el9_2 | RHSA-2023:7370 |
| RHEL 8.8 EUS | kpatch-patch-4_18_0-477_10_1 | 1-4.el8_8 | RHSA-2023:7558 |
| RHEL 8.8 EUS | kpatch-patch-4_18_0-477_13_1 +1 | 1-3.el8_8 | RHSA-2023:7558 |
| RHEL 8.8 EUS | kpatch-patch-4_18_0-477_21_1 | 1-2.el8_8 | RHSA-2023:7558 |
| RHEL 8.8 EUS | kpatch-patch-4_18_0-477_27_1 | 1-1.el8_8 | RHSA-2023:7558 |
| RHEL 8.8 EUS | perf +26 | 4.18.0-477.36.1.el8_8 | RHSA-2023:7539 |
| RHEL 7.7 AUS | perf +12 | 3.10.0-1062.82.1.el7 | RHSA-2024:0262 |
| RHEL 7.6 AUS | perf +12 | 3.10.0-957.109.1.el7 | RHSA-2024:0261 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | perf +24 | 4.18.0-513.5.1.el8_9 | ALSA-2023:7077 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.49-69.116 | 1.0-0.amzn2023 | ALAS2023-2023-330 |
| Amazon Linux 2023 | perf +12 | 6.1.49-69.116.amzn2023 | ALAS2023-2023-330 |
| Amazon Linux 2 | kernel-livepatch-4.14.326-245.539 | 1.0-0.amzn2 | ALAS2-2023-2264 |
| Amazon Linux 2 | perf +8 | 4.14.326-245.539.amzn2 | ALAS2-2023-2264 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.131.1-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.2.0-362.8.1.el9_3 | ELSA-2023-6583 |
| Oracle Linux 9 | rv +25 | 5.14.0-362.8.1.el9_3 | ELSA-2023-6583 |
| Oracle Linux 8 | perf +19 | 4.18.0-513.5.1.el8_9 | ELSA-2023-7077 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.81.2.el7uek | ELSA-2023-13019 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.105.1.0.1.el7 | ELSA-2023-7423 |
Advisories 26
- ALSA-2023:7077 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:7077 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2023:6583 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:0262 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:0261 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:7424 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:7419 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:7423 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:6901 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:7539 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2023:7379 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2023:7370 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2023:7418 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2023:7558 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- DSA-5492-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3710-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ALAS2023-2023-330 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 11, 2026
- ALAS2-2023-2264 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 11, 2026
- WID-SEC-2025-1293 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 3, 2025
- WID-SEC-2024-1086 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 19, 2025
- WID-SEC-2023-2284 Linux Kernel: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · May 13, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ELSA-2023-13019 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 6, 2023
- ELSA-2023-7423 Important: kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 22, 2023
- ELSA-2023-7077 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 17, 2023
- ELSA-2023-6583 Important: kernel security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 12, 2023