Description
In the Linux kernel, the following vulnerability has been resolved:
x86/fpu: Stop relying on userspace for info to fault in xsave buffer
Before this change, the expected size of the user space buffer was
taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed
from user-space, so it is possible construct a sigreturn frame where:
* fx_sw->xstate_size is smaller than the size required by valid bits in
fx_sw->xfeatures.
* user-space unmaps parts of the sigrame fpu buffer so that not all of
the buffer required by xrstor is accessible.
In this case, xrstor tries to restore and accesses the unmapped area
which results in a fault. But fault_in_readable succeeds because buf +
fx_sw->xstate_size is within the still mapped area, so it goes back and
tries xrstor again. It will spin in this loop forever.
Instead, fault in the maximum size which can be touched by XRSTOR (taken
from fpstate->user_size).
[ dhansen: tweak subject / changelog ]
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.14 | 5.15.150 |
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 | 6.7.7-1 | — |
| Debian 13 | linux | 6.7.7-1 | — |
| Debian 12 | linux | 6.1.82-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1044.46 | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-112.122 | USN-6820-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1063.69 | USN-6821-3 |
| Ubuntu 22.04 LTS | linux-aws-6.5 | 6.5.0-1023.23~22.04.1 | USN-6895-3 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1066.75 | USN-6821-4 |
| Ubuntu 22.04 LTS | linux-azure-6.5 | 6.5.0-1024.25~22.04.1 | USN-6895-2 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1067.76.1 | USN-6821-4 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1062.70 | USN-6820-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.5 | 6.5.0-1024.26~22.04.1 | USN-6895-2 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1060.66 | USN-6821-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1046.53 | USN-6821-2 |
| Ubuntu 22.04 LTS | linux-hwe-6.5 | 6.5.0-44.44~22.04.1 | USN-6900-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1056.59 | USN-6821-1 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1058.64 | USN-6821-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1060.65 | USN-6821-2 |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-110.120 | USN-6820-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.5 | 6.5.0-44.44.1~22.04.1 | USN-6895-3 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1058.59 | USN-6820-2 |
| Ubuntu 22.04 LTS | linux-nvidia-6.5 | 6.5.0-1023.24 | USN-6895-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1026.26 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1015.15 | — |
| Ubuntu 22.04 LTS | linux-oem-6.5 | 6.5.0-1027.28 | USN-6895-4 |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1061.67 | USN-6821-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.5 | 6.5.0-1026.26~22.04.1 | USN-6895-3 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1058.61 | USN-6919-1 |
| Ubuntu 22.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-starfive-6.5 | 6.5.0-1017.18~22.04.1 | USN-6895-3 |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1030.34 | USN-6820-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1063.69~20.04.1 | USN-6821-3 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1065.74~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1062.70~20.04.1 | USN-6820-1 |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1046.53~20.04.1 | USN-6821-2 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-113.123~20.04.1 | USN-6871-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1057.60~20.04.1 | USN-6892-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1058.64~20.04.1 | USN-6828-1 |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-110.120~20.04.1 | USN-6820-1 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1027.27~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1061.67~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1059.63~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2001.1 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1056.58 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1064.72 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1063.69+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1065.74+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-111.121+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1062.70+fips1 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.4.0-503.11.1.el9_5 | RHSA-2024:9315 |
| RHEL 9 | rv +67 | 5.14.0-503.11.1.el9_5 | RHSA-2024:9315 |
| RHEL 8 | kernel-rt +12 | 4.18.0-553.5.1.rt7.346.el8_10 | RHSA-2024:3627 |
| RHEL 8 | perf +26 | 4.18.0-553.5.1.el8_10 | RHSA-2024:3618 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | bpftool | 7.3.0-427.59.1.el9_4 | RHSA-2025:2490 |
| RHEL 9.4 EUS | rv +64 | 5.14.0-427.59.1.el9_4 | RHSA-2025:2490 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-rt +11 | 4.18.0-553.5.1.rt7.346.el8_10 | ALSA-2024:3627 |
| AlmaLinux 8 | perf +24 | 4.18.0-553.5.1.el8_10 | ALSA-2024:3618 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | kernel | 4.18.0-553.5.1.el8_10 | RLSA-2024:3618 |
| Rocky Linux 8 | kernel-rt | 4.18.0-553.5.1.rt7.346.el8_10 | RLSA-2024:3627 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.52.1 | SUSE-SU-2024:0858-1 |
| SLES 15 SP5 | kernel-azure +2 | 5.14.21-150500.33.37.1 | SUSE-SU-2024:0855-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.52.1.150500.6.23.1 | SUSE-SU-2024:0858-1 |
| SLES 15 SP4 | kernel-64kb +3 | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| SLES 15 SP4 | kernel-syms +2 | 5.14.21-150400.24.111.1 | SUSE-SU-2024:0900-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| SLES for SAP 15 SP4 | kernel-docs +1 | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLES for SAP 15 SP4 | kernel-syms +2 | 5.14.21-150400.24.111.1 | SUSE-SU-2024:0900-1 |
| SLE Micro 5.5 | kernel-default | 5.14.21-150500.55.52.1 | SUSE-SU-2024:0858-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.52.1.150500.6.23.1 | SUSE-SU-2024:0858-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.38.1 | SUSE-SU-2024:0910-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.71.1 | SUSE-SU-2024:0977-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.71.1 | SUSE-SU-2024:0977-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.52.1 | SUSE-SU-2024:0858-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_11 +1 | 1-150500.11.3.1 | SUSE-SU-2024:0910-1, SUSE-SU-2024:0858-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_19 | 1-150400.1.3.1 | SUSE-SU-2024:0977-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_24 | 1-150400.9.3.1 | SUSE-SU-2024:0900-1 |
| SLE HPC 15 SP4 | kernel-64kb +2 | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| SLE HPC 15 SP4 | kernel-syms +2 | 5.14.21-150400.24.111.1 | SUSE-SU-2024:0900-1 |
| SUSE Real Time Module 15 SP5 | kernel-rt +3 | 5.14.21-150500.13.38.1 | SUSE-SU-2024:0910-1 |
| SUSE Manager Server 4.3 | kernel-default +1 | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
| SUSE Manager Server 4.3 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
| SUSE Manager Server 4.3 | kernel-syms +1 | 5.14.21-150400.24.111.1 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
| SUSE Manager Proxy 4.3 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
| SUSE Manager Proxy 4.3 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
| SUSE Manager Proxy 4.3 | kernel-syms +1 | 5.14.21-150400.24.111.1 | SUSE-SU-2024:0900-2, SUSE-SU-2024:0900-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | dtb-aarch64 +10 | 5.14.21-150500.55.52.1 | SUSE-SU-2024:0858-1 |
| openSUSE Leap 15.5 | kernel-azure +2 | 5.14.21-150500.33.37.1 | SUSE-SU-2024:0855-1 |
| openSUSE Leap 15.5 | kernel-default-base | 5.14.21-150500.55.52.1.150500.6.23.1 | SUSE-SU-2024:0858-1 |
| openSUSE Leap 15.5 | kernel-rt +3 | 5.14.21-150500.13.38.1 | SUSE-SU-2024:0910-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| openSUSE Leap Micro 5.4 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| openSUSE Leap Micro 5.4 | kernel-rt | 5.14.21-150400.15.71.1 | SUSE-SU-2024:0977-1 |
| openSUSE Leap Micro 5.3 | kernel-default | 5.14.21-150400.24.111.2 | SUSE-SU-2024:0900-1 |
| openSUSE Leap Micro 5.3 | kernel-default-base | 5.14.21-150400.24.111.2.150400.24.52.1 | SUSE-SU-2024:0900-1 |
| openSUSE Leap Micro 5.3 | kernel-rt | 5.14.21-150400.15.71.1 | SUSE-SU-2024:0977-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.79-99.164 | 1.0-0.amzn2023 | ALAS2023-2024-549 |
| Amazon Linux 2023 | perf +14 | 6.1.79-99.164.amzn2023 | ALAS2023-2024-549 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.4.0-503.11.1.el9_5 | ELSA-2024-9315 |
| Oracle Linux 9 | rv +28 | 5.14.0-503.11.1.el9_5 | ELSA-2024-9315 |
| Oracle Linux 8 | perf +19 | 4.18.0-553.5.1.el8_10 | ELSA-2024-3618 |
Advisories 33
- RHSA-2024:9315 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2024:3627 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- USN-6828-1 linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- ALSA-2024:3627 Moderate: kernel-rt security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:3618 Moderate: kernel update AlmaLinux Security Advisories · Oct 29, 2026
- USN-6919-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6821-4 linux-azure, linux-azure-fde vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6871-1 linux-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6820-1 linux, linux-gcp, linux-gcp-5.15, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6821-1 linux-gke, linux-ibm, linux-intel-iotg, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6821-2 linux-gkeop, linux-gkeop-5.15, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6821-3 linux-aws, linux-aws-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6892-1 linux-ibm-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6820-2 linux-nvidia vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-6895-3 linux-aws-6.5, linux-lowlatency-hwe-6.5, linux-oracle-6.5, linux-starfive-6.5 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6900-1 linux-hwe-6.5 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6895-2 linux-azure-6.5, linux-gcp-6.5 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6895-4 linux-oem-6.5 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6895-1 linux, linux-gcp, linux-nvidia-6.5, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- RHSA-2024:3618 Red Hat Security Advisory: kernel update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2025:2490 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2024-0475 Linux-Kernel: Mehrere Schwachstellen ermöglichen Denial of Service und unspezifische Angriffe BSI CERT-Bund (WID) · Feb 16, 2026
- RLSA-2024:3627 Moderate: kernel-rt security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2024:3618 Moderate: kernel update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:0977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0858-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0855-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0910-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0900-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2024:0900-2 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2023-2024-549 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 10, 2025
- ELSA-2024-9315 Moderate: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
- ELSA-2024-3618 Moderate: kernel update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 5, 2024
References
- https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a
- https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996
- https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2
- https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda
- https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835