Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: taprio: extend minimum interval restriction to entire cycle too
It is possible for syzbot to side-step the restriction imposed by the
blamed commit in the Fixes: tag, because the taprio UAPI permits a
cycle-time different from (and potentially shorter than) the sum of
entry intervals.
We need one more restriction, which is that the cycle time itself must
be larger than N * ETH_ZLEN bit times, where N is the number of schedule
entries. This restriction needs to apply regardless of whether the cycle
time came from the user or was the implicit, auto-calculated value, so
we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)"
branch. This way covers both conditions and scenarios.
Add a selftest which illustrates the issue triggered by syzbot.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.4.68 – < 5.5, 5.8.12 – < 5.9, 5.9 | 5.5 |
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 | 6.9.7-1 | — |
| Debian 13 | linux | 6.9.7-1 | — |
| Debian 12 | linux | 6.1.119-1 | DSA-5818-1 |
| Debian 11 | linux-6.1 | 6.1.119-1~deb11u1 | DLA-4008-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-44.44 | USN-6999-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1015.16 | USN-6999-1 |
| Ubuntu 24.04 LTS | linux-gcp +1 | 6.8.0-1014.16 | USN-7004-1, USN-6999-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1010.13 | USN-6999-1 |
| Ubuntu 24.04 LTS | linux-ibm +2 | 6.8.0-1012.12 | USN-6999-1 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1013.14 | USN-7005-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1013.14.1 | USN-7005-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1011.12 | USN-6999-2 |
| Ubuntu 24.04 LTS | linux-riscv +1 | 6.8.0-44.44.1 | USN-6999-1 |
| Ubuntu 22.04 LTS | linux +49 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1015.16~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-gcp-6.8 +1 | 6.8.0-1014.16~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-45.45~22.04.1 | USN-7029-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 +1 | 6.8.0-1012.12~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1013.14~22.04.1 | USN-7005-2 |
| Ubuntu 22.04 LTS | linux-riscv-6.8 +1 | 6.8.0-44.44.1~22.04.1 | USN-7008-1 |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
Show 10 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 24.04 LTS | linux-raspi-realtime | 6.8.0-2010.10 | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1008.8 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1008.8~22.04.1 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +21 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 +6 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.3.0-427.42.1.el9_4 | RHSA-2024:8617 |
| RHEL 9 | rv +64 | 5.14.0-427.42.1.el9_4 | RHSA-2024:8617 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | bpftool | 7.0.0-284.88.1.el9_2 | RHSA-2024:8157 |
| RHEL 9.2 EUS | kernel-rt +14 | 5.14.0-284.88.1.rt14.373.el9_2 | RHSA-2024:8158 |
| RHEL 9.2 EUS | perf +48 | 5.14.0-284.88.1.el9_2 | RHSA-2024:8157 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | bpftool | 7.3.0-427.42.1.el9_4 | ALSA-2024:8617 |
| AlmaLinux 9 | rv +60 | 5.14.0-427.42.1.el9_4 | ALSA-2024:8617 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | kernel | 5.14.0-427.42.1.el9_4 | RLSA-2024:8617 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.30.1 | SUSE-SU-2024:4318-1 |
| SLES 15 SP6 | kernel-azure | 6.4.0-150600.8.17.2 | SUSE-SU-2024:3984-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.9.coco15sp6.1 | SUSE-SU-2024:4387-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.30.1.150600.12.12.6 | SUSE-SU-2024:4318-1 |
| SLES 15 SP6 | kernel-syms-azure +1 | 6.4.0-150600.8.17.1 | SUSE-SU-2024:3984-1 |
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.88.1 | SUSE-SU-2024:4364-1 |
| SLES 15 SP5 | kernel-azure +2 | 5.14.21-150500.33.72.1 | SUSE-SU-2024:3983-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.88.1.150500.6.39.4 | SUSE-SU-2024:4364-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | kernel-default-base | 6.4.0-24.1.21.4 | SUSE-SU-2025:20247-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0-RT_Update_4 | 1-1.1 | SUSE-SU-2025:20246-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0_Update_4 | 1-1.2 | SUSE-SU-2025:20247-1 |
| SLE Micro 6.1 | kernel-rt +1 | 6.4.0-22.1 | SUSE-SU-2025:20246-1 |
| SLE Micro 6.1 | kernel-source +2 | 6.4.0-24.1 | SUSE-SU-2025:20247-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-24.1.21.4 | SUSE-SU-2025:20164-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0-RT_Update_4 | 1-1.1 | SUSE-SU-2025:20163-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_4 | 1-1.2 | SUSE-SU-2025:20164-1 |
| SLE Micro 6.0 | kernel-rt +1 | 6.4.0-22.1 | SUSE-SU-2025:20163-1 |
| SLE Micro 6.0 | kernel-source +2 | 6.4.0-24.1 | SUSE-SU-2025:20164-1 |
| SLE Micro 5.5 | kernel-default | 5.14.21-150500.55.88.1 | SUSE-SU-2024:4364-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.88.1.150500.6.39.4 | SUSE-SU-2024:4364-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.76.1 | SUSE-SU-2024:3985-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.30.1 | SUSE-SU-2024:4318-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_5 | 1-150600.1.3.1 | SUSE-SU-2024:3986-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_6 | 1-150600.13.3.5 | SUSE-SU-2024:4318-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.88.1 | SUSE-SU-2024:4364-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5-RT_Update_22 | 1-150500.11.3.1 | SUSE-SU-2024:3985-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_21 | 1-150500.11.5.1 | SUSE-SU-2024:4364-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.17.1 | SUSE-SU-2024:3986-1 |
| SUSE Real Time Module 15 SP5 | kernel-rt +3 | 5.14.21-150500.13.76.1 | SUSE-SU-2024:3985-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +10 | 6.4.0-150600.23.30.1 | SUSE-SU-2024:4318-1 |
| openSUSE Leap 15.6 | kernel-azure | 6.4.0-150600.8.17.2 | SUSE-SU-2024:3984-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.30.1.150600.12.12.6 | SUSE-SU-2024:4318-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.17.1 | SUSE-SU-2024:3986-1 |
| openSUSE Leap 15.6 | kernel-syms-azure +1 | 6.4.0-150600.8.17.1 | SUSE-SU-2024:3984-1 |
| openSUSE Leap 15.5 | kernel-azure +2 | 5.14.21-150500.33.72.1 | SUSE-SU-2024:3983-1 |
| openSUSE Leap 15.5 | kernel-rt +3 | 5.14.21-150500.13.76.1 | SUSE-SU-2024:3985-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.5 | kernel-rt | 5.14.21-150500.13.76.1 | SUSE-SU-2024:3985-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.3.0-427.42.1.el9_4 | ELSA-2024-8617 |
| Oracle Linux 9 | rv +27 | 5.14.0-427.42.1.el9_4 | ELSA-2024-8617 |
Advisories 27
- WID-SEC-2024-1422 Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 29, 2026
- ALSA-2024:8617 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-6999-1 linux, linux-aws, linux-gcp, linux-gke, linux-ibm, linux-lowlatency, linux-oem-6.8, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7029-1 linux-hwe-6.8 Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7005-1 linux-nvidia, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7005-2 linux-nvidia-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7004-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7008-1 linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-6999-2 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- RHSA-2024:8617 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:8157 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2024:8158 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- SUSE-SU-2025:20163-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20246-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20164-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20247-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4008-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5818-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:8617 Moderate: kernel security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:3985-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4318-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3984-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3986-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4364-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4387-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3983-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-8617 Moderate: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 30, 2024