Description
In the Linux kernel, the following vulnerability has been resolved:
x86/bugs: Use code segment selector for VERW operand
Robert Gill reported below #GP in 32-bit mode when dosemu software was
executing vm86() system call:
general protection fault: 0000 [#1] PREEMPT SMP
CPU: 4 PID: 4610 Comm: dosemu.bin Not tainted 6.6.21-gentoo-x86 #1
Hardware name: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 10/30/2010
EIP: restore_all_switch_stack+0xbe/0xcf
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc
DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046
CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0
Call Trace:
show_regs+0x70/0x78
die_addr+0x29/0x70
exc_general_protection+0x13c/0x348
exc_bounds+0x98/0x98
handle_exception+0x14d/0x14d
exc_bounds+0x98/0x98
restore_all_switch_stack+0xbe/0xcf
exc_bounds+0x98/0x98
restore_all_switch_stack+0xbe/0xcf
This only happens in 32-bit mode when VERW based mitigations like MDS/RFDS
are enabled. This is because segment registers with an arbitrary user value
can result in #GP when executing VERW. Intel SDM vol. 2C documents the
following behavior for VERW instruction:
#GP(0) - If a memory operand effective address is outside the CS, DS, ES,
FS, or GS segment limit.
CLEAR_CPU_BUFFERS macro executes VERW instruction before returning to user
space. Use %cs selector to reference VERW operand. This ensures VERW will
not #GP for an arbitrary user %ds.
[ mingo: Fixed the SOB chain. ]
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.10.215 – < 5.10.229, 5.15.154 – < 5.15.171, 6.1.81 – < 6.1.116, 6.6.21 – < 6.6.58, 6.7.9 – < 6.8, 6.8 | 5.10.229 |
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 | 6.11.5-1 | — |
| Debian 13 | linux | 6.11.5-1 | — |
| Debian 12 | linux | 6.1.119-1 | DSA-5818-1 |
| Debian 11 | linux | 5.10.234-1 | DLA-4075-1 |
| 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 | 5.15.0-1060.62 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-56.58 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1025.27 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1025.30 | USN-7384-1 |
| Ubuntu 24.04 LTS | linux-azure-6.11 | 6.11.0-1012.12~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1014.15 | USN-7468-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1026.28 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 | 6.11.0-1011.11~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1021.25 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1008.10 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1022.22 | USN-7385-1 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1024.27 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1007.7 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1024.27.1 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1004.4 | — |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1015.15 | USN-7310-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1024.24 | USN-7386-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1022.23 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1028.32 | USN-7524-1 |
| Ubuntu 24.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-riscv +1 | 6.8.0-56.58.1 | USN-7383-1 |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1017.18 | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-133.144 | USN-7288-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1078.85 | USN-7308-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1027.29~22.04.1 | USN-7451-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1081.90 | USN-7289-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1025.30~22.04.1 | USN-7384-2 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1081.90.1 | USN-7289-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1077.86 | USN-7291-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1026.28~22.04.1 | USN-7383-1 |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1075.81 | USN-7291-1, USN-7289-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1060.68 | USN-7289-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-57.59~22.04.1 | USN-7403-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1070.73 | USN-7289-3 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1023.23~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1073.79 | USN-7289-4 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1076.81 | USN-7388-1 |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-133.143 | USN-7288-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1072.73 | USN-7289-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1024.27~22.04.1 | USN-7383-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1033.33 | USN-7389-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1021.21 | USN-7389-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1022.23~22.04.1 | USN-7383-1 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1072.75 | USN-7305-1 |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 +1 | 6.8.0-56.58.1~22.04.1 | USN-7383-1 |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1044.48 | USN-7390-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1080.87~20.04.1 | USN-7388-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1081.90~20.04.1 | USN-7289-2 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1081.90~20.04.1.1 | USN-7289-2 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1077.86~20.04.1 | USN-7291-1 |
| Ubuntu 20.04 LTS | linux-gke +27 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-134.145~20.04.1 | USN-7331-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1074.77~20.04.1 | USN-7458-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1073.79~20.04.2 | USN-7289-4 |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-133.143~20.04.1 | USN-7288-2 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1075.81~20.04.1 | USN-7289-2 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1073.77~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
Show 6 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 | 6.8.0-2023.24 | USN-7523-1 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1018.19 | USN-7383-2 |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1071.73 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1078.86 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1018.19~22.04.1 | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1078.85+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1080.89+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-133.144+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1077.86+fips1 | — |
| Ubuntu Pro 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1039.39~20.04.1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kernel-source | 6.11.8-1.1 | openSUSE-SU-2024:14500-1 |
| openSUSE Tumbleweed | kernel-source-longterm | 6.12.11-1.1 | openSUSE-SU-2025:14705-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.119-129.201 | 1.0-0.amzn2023 | ALAS2023-2025-802 |
| Amazon Linux 2023 | perf +14 | 6.1.119-129.201.amzn2023 | ALAS2023-2025-802 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.64.2-1 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.176.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | bpftool +13 | 5.15.0-303.171.5.2.el9uek | ELSA-2024-12887 |
Advisories 34
- USN-7468-1 linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7451-1 linux-aws-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7524-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7523-1 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7310-1 linux-oem-6.11 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7384-2 linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7384-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7383-1 linux, linux-aws, linux-gcp, linux-gcp-6.8, linux-gke, linux-gkeop, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7458-1 linux-ibm-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7289-2 linux-azure-5.15, linux-azure-fde-5.15, linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7289-1 linux-azure, linux-azure-fde, linux-gkeop, linux-nvidia, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7289-3 linux-ibm vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7388-1 linux-aws-5.15, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7389-1 linux-nvidia-tegra, linux-nvidia-tegra-igx vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7386-1 linux-oem-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7383-2 linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7291-1 linux-gcp, linux-gcp-5.15, linux-gke vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7390-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7403-1 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7288-1 linux, linux-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7289-4 linux-intel-iotg, linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7385-1 linux-ibm vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7308-1 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7331-1 linux-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7305-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7288-2 linux-lowlatency-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- WID-SEC-2024-3289 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 3, 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
- DLA-4075-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:14705-1 kernel-devel-longterm-6.12.11-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14500-1 kernel-devel-6.11.8-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2025-802 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 2, 2025
- ELSA-2024-12887 Important: Unbreakable Enterprise kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 18, 2024
References
- https://git.kernel.org/stable/c/bfd1d223d80cb29a210caa1bd5e21f0816d58f02
- https://git.kernel.org/stable/c/ada431c6c31a2c8c37991c46089af5caa23a9c6e
- https://git.kernel.org/stable/c/38c5fe74f3bef98f75d16effa49836d50c9b6097
- https://git.kernel.org/stable/c/481b477ab63c7245715a3e57ba79eb87c2dc0d02
- https://git.kernel.org/stable/c/bc576fbaf82deded606e69a00efe9752136bf91d
- https://git.kernel.org/stable/c/e4d2102018542e3ae5e297bc6e229303abff8a0f