In the Linux kernel, the following vulnerability has been resolved:
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
The usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit() path is very broken.
sys_prlimit64() does get_task_struct(tsk) but this only protects task_struct itself. If tsk != current and tsk is not a leader, this process can exit/exec and task_lock(tsk->group_leader) may use the already freed task_struct.
Another problem is that sys_prlimit64() can race with mt-exec which changes ->group_leader. In this case do_prlimit() may take the wrong lock, or (worse) ->group_leader may change between task_lock() and task_unlock().
Change sys_prlimit64() to take tasklist_lock when necessary. This is not nice, but I don't see a better fix for -stable.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-headersUpgrade kernel-livepatch-6.1.158-178.288Upgrade kernel-toolsUpgrade kernel6.12-libbpf-develUpgrade perf6.12-debuginfoUpgrade bpftoolUpgrade kernel6.12-tools-debuginfoUpgrade kernel-libbpf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel6.12-develUpgrade python3-perf6.12-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel6.12-libbpfUpgrade kernel6.12-libbpf-staticUpgrade kernel-modules-extra-commonUpgrade perfUpgrade kernel-develUpgrade perf6.12Upgrade kernel6.12-libbpf-debuginfoUpgrade perf-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernel-modules-extraUpgrade kernel-libbpf-develUpgrade bpftool6.12Upgrade python3-perf6.12Upgrade kernel-debuginfo-common-x86_64Upgrade bpftool6.12-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-modules-extra-commonUpgrade kernel-libbpfUpgrade bpftool-debuginfoUpgrade python3-perfUpgrade kernel-livepatch-6.12.55-74.119Upgrade kernel6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12-modules-extraUpgrade kernel-headersUpgrade kernel-tools-develUpgrade kernel6.12Upgrade kernel-debuginfoUpgrade kernel | Dec 9, 2025 | Nov 12, 2025 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Nov 14, 2025 | Nov 14, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Nov 12, 2025 |
| Ubuntu | — | Upgrade linux-image-6.17.0-1011-oemUpgrade linux-image-6.17.0-14-genericUpgrade linux-image-6.8.0-1047-oracle-64kUpgrade linux-image-aws-fips-6.8Upgrade linux-image-oracle-64k-6.17Upgrade linux-image-kvmUpgrade linux-image-nvidia-6.8Upgrade linux-image-fipsUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oem-6.17Upgrade linux-image-gke-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.17.0-1007-gcpUpgrade linux-image-generic-64k-6.17Upgrade linux-image-6.17.0-1007-oracle-64kUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-aws-fipsUpgrade linux-image-oracleUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.17.0-14-generic-64kUpgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-6.8.0-1050-aws-fipsUpgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-ibm-6.8Upgrade linux-image-awsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.17.0-1008-raspiUpgrade linux-image-6.17.0-1007-gcp-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-aws-64k-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-azure-lts-24.04Upgrade linux-image-realtimeUpgrade linux-image-6.17.0-1007-awsUpgrade linux-image-gcp-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-lowlatency-6.8Upgrade linux-image-virtual-6.8Upgrade linux-image-6.17.0-1007-aws-64kUpgrade linux-image-6.17.0-1007-oracleUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-raspiUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-oracle-6.17Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-aws-64k-6.17Upgrade linux-image-gcp-6.17Upgrade linux-image-oem-22.04Upgrade linux-image-ibmUpgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-gkeop-6.8Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-6.8.0-106-fipsUpgrade linux-image-azure-fips-6.8Upgrade linux-image-xilinx-6.8Upgrade linux-image-xilinxUpgrade linux-image-virtual-6.17Upgrade linux-image-6.8.0-1050-awsUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.17.0-1008-azureUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-gcpUpgrade linux-image-6.8.0-1035-gkeopUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-realtime-6.17Upgrade linux-image-aws-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-oem-22.04cUpgrade linux-image-generic-6.17Upgrade linux-image-aws-6.17Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-oracle-64kUpgrade linux-image-gke-6.8Upgrade linux-image-gkeopUpgrade linux-image-fips-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-aws-64kUpgrade linux-image-6.8.0-106-genericUpgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-raspi-6.17Upgrade linux-image-oracle-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidiaUpgrade linux-image-azure-6.17Upgrade linux-image-genericUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-raspi-6.8Upgrade linux-image-6.17.0-1006-realtimeUpgrade linux-image-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-gke-64k-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gkeUpgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-22.04dUpgrade linux-image-azureUpgrade linux-image-nvidia-lowlatency-64k-6.8 | Feb 13, 2026 | Feb 12, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Nov 12, 2025 |
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