Description
In the Linux kernel, the following vulnerability has been resolved:
topology: Keep the cpumask unchanged when printing cpumap
During fuzz testing, the following warning was discovered:
different return values (15 and 11) from vsnprintf("%*pbl
", ...)
test:keyward is WARNING in kvasprintf
WARNING: CPU: 55 PID: 1168477 at lib/kasprintf.c:30 kvasprintf+0x121/0x130
Call Trace:
kvasprintf+0x121/0x130
kasprintf+0xa6/0xe0
bitmap_print_to_buf+0x89/0x100
core_siblings_list_read+0x7e/0xb0
kernfs_file_read_iter+0x15b/0x270
new_sync_read+0x153/0x260
vfs_read+0x215/0x290
ksys_read+0xb9/0x160
do_syscall_64+0x56/0x100
entry_SYSCALL_64_after_hwframe+0x78/0xe2
The call trace shows that kvasprintf() reported this warning during the
printing of core_siblings_list. kvasprintf() has several steps:
(1) First, calculate the length of the resulting formatted string.
(2) Allocate a buffer based on the returned length.
(3) Then, perform the actual string formatting.
(4) Check whether the lengths of the formatted strings returned in
steps (1) and (2) are consistent.
If the core_cpumask is modified between steps (1) and (3), the lengths
obtained in these two steps may not match. Indeed our test includes cpu
hotplugging, which should modify core_cpumask while printing.
To fix this issue, cache the cpumask into a temporary variable before
calling cpumap_print_{list, cpumask}_to_buf(), to keep it unchanged
during the printing process.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.15 | 5.15.177 |
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 | 6.12.10-1 | — |
| Debian 13 | linux | 6.12.10-1 | — |
| Debian 12 | linux | 6.1.128-1 | DSA-5860-1 |
| Debian 11 | linux-6.1 | 6.1.128-1~deb11u1 | DLA-4076-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1062.64 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-60.63 | USN-7513-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1029.31 | USN-7513-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1029.34 | USN-7513-3 |
| Ubuntu 24.04 LTS | linux-azure-6.11 | 6.11.0-1012.12~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1016.17 | USN-7522-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1030.32 | USN-7515-2 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 | 6.11.0-1011.11~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1025.29 | USN-7515-1 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1012.14 | USN-7515-2 |
| Ubuntu 24.04 LTS | linux-hwe-6.11 | 6.11.0-21.21~24.04.1 | USN-7379-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1026.26 | USN-7513-1 |
| Ubuntu 24.04 LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1011.12~24.04.1 | USN-7381-1 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1028.31 | USN-7514-1 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1007.7 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1028.31.1 | USN-7514-1 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1008.8 | — |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1017.17 | USN-7382-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1028.28 | USN-7513-3 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1026.27 | USN-7513-1 |
| 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 | 6.8.0-60.63.1 | USN-7513-1 |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1017.18 | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-135.146 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1080.87 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1029.31~22.04.1 | USN-7513-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1084.93 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1029.34~22.04.1 | USN-7513-3 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1084.93.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1079.88 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1030.32~22.04.1 | USN-7515-2 |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1077.83 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1062.70 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-60.63~22.04.1 | USN-7513-4 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1072.75 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1026.26~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1073.75 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1075.81 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1076.81 | USN-7388-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-60.63.1~22.04.1 | USN-7513-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1074.75 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1028.31~22.04.1 | USN-7514-1 |
| 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 | 6.8.0-1026.27~22.04.1 | USN-7513-5 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1074.77 | USN-7387-1 |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 | 6.8.0-62.65~22.04.1 | — |
| 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 | 5.15.0-1086.95~20.04.1 | USN-7421-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1086.95~20.04.1.1 | USN-7421-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1081.90~20.04.1 | USN-7459-2 |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-136.147~20.04.1 | USN-7407-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1074.77~20.04.1 | USN-7458-1 |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-135.146~20.04.1 | USN-7387-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 +1 | 5.15.0-1077.83~20.04.1 | USN-7459-1, USN-7387-1 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1075.79~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 7 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 | 6.8.1-1022.23 | USN-7513-2 |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1073.75 | USN-7387-3 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1080.88 | USN-7387-3 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1022.23~22.04.1 | — |
| 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 | 5.15.0-1080.87+fips1 | USN-7387-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1083.92+fips1 | USN-7387-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-135.146+fips1 | USN-7387-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1079.88+fips1 | USN-7387-2 |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1039.39~20.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.38.1 | SUSE-SU-2025:0499-1 |
| SLES 15 SP6 | kernel-azure +2 | 6.4.0-150600.8.26.1 | SUSE-SU-2025:0428-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.15.coco15sp6.1 | SUSE-SU-2025:0564-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.38.1.150600.12.16.2 | SUSE-SU-2025:0499-1 |
Show 4 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-2025:20248-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0-RT_Update_5 | 1-1.1 | SUSE-SU-2025:20249-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0_Update_5 | 1-1.2 | SUSE-SU-2025:20248-1 |
| SLE Micro 6.1 | kernel-rt +4 | 6.4.0-25.1 | SUSE-SU-2025:20249-1, SUSE-SU-2025:20248-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-24.1.21.4 | SUSE-SU-2025:20165-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0-RT_Update_5 | 1-1.1 | SUSE-SU-2025:20166-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_5 | 1-1.2 | SUSE-SU-2025:20165-1 |
| SLE Micro 6.0 | kernel-rt +4 | 6.4.0-25.1 | SUSE-SU-2025:20166-1, SUSE-SU-2025:20165-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.38.1 | SUSE-SU-2025:0499-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_8 | 1-150600.1.3.1 | SUSE-SU-2025:0557-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_8 | 1-150600.13.3.2 | SUSE-SU-2025:0499-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.26.1 | SUSE-SU-2025:0557-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +10 | 6.4.0-150600.23.38.1 | SUSE-SU-2025:0499-1 |
| openSUSE Leap 15.6 | kernel-azure +2 | 6.4.0-150600.8.26.1 | SUSE-SU-2025:0428-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.38.1.150600.12.16.2 | SUSE-SU-2025:0499-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.26.1 | SUSE-SU-2025:0557-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.127-135.201 | 1.0-0.amzn2023 | ALAS2023-2025-823 |
| Amazon Linux 2023 | perf +14 | 6.1.127-135.201.amzn2023 | ALAS2023-2025-823 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-101.33.4.3.el10uek | ELSA-2025-20530, ELSA-2025-20480 |
Advisories 43
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- WID-SEC-2025-0119 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 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-7522-1 linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7513-1 linux, linux-aws, linux-aws-6.8, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7513-2 linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7513-3 linux-azure, linux-azure-6.8, linux-oem-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7515-2 linux-gcp, linux-gcp-6.8, linux-gkeop vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7514-1 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7513-4 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7515-1 linux-gke vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7513-5 linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7459-1 linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7459-2 linux-gcp-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7387-1 linux, linux-aws, linux-azure, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-intel-iotg, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7387-2 linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7458-1 linux-ibm-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7387-3 linux-realtime, linux-intel-iot-realtime 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-7421-1 linux-azure-5.15, linux-azure-fde-5.15 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-7379-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-6.11, linux-oracle, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7390-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7407-1 linux-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7382-1 linux-oem-6.11 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- ICSA-26-295-11 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Oct 22, 2026
- SSA-019113 SSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6 Siemens ProductCERT · Oct 13, 2026
- ICSA-26-209-04 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Jul 28, 2026
- USN-7381-1 linux-lowlatency-hwe-6.11 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- SUSE-SU-2025:20165-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20166-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20248-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20249-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5860-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4076-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:0564-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0557-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0499-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0428-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2025-20530 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2025
- ELSA-2025-20480 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 17, 2025
- ALAS2023-2025-823 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 10, 2025
References
- https://git.kernel.org/stable/c/1c7818e2746e747838a3de1687e89eac7b947f08
- https://git.kernel.org/stable/c/ca47e933a900492d89dcf5db18a99c28bd4a742d
- https://git.kernel.org/stable/c/b02cf1d27e460ab2b3e1c8c9ce472d562cad2e8d
- https://git.kernel.org/stable/c/360596e7fe319a5db1b5fb34a3952862ae53c924
- https://git.kernel.org/stable/c/cbd399f78e23ad4492c174fc5e6b3676dba74a52