High · 8.4 CVE-2023-52629 EUVD-2023-57253GHSA-384v-9gx5-rmx4

sh: push-switch: Reorder cleanup operations to avoid use-after-free bug

Published Mar 29, 2024 · Updated Oct 3, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.5 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

sh: push-switch: Reorder cleanup operations to avoid use-after-free bug

The original code puts flush_work() before timer_shutdown_sync()
in switch_drv_remove(). Although we use flush_work() to stop
the worker, it could be rescheduled in switch_timer(). As a result,
a use-after-free bug can occur. The details are shown below:

(cpu 0) | (cpu 1)
switch_drv_remove() |
flush_work() |
... | switch_timer // timer
| schedule_work(&psw->work)
timer_shutdown_sync() |
... | switch_work_handler // worker
kfree(psw) // free |
| psw->state = 0 // use

This patch puts timer_shutdown_sync() before flush_work() to
mitigate the bugs. As a result, the worker and timer will be
stopped safely before the deallocate operations.

Affected products

Vendor	Product	Affected	Fixed
Linux	Linux	2.6.20	6.1.189

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	6.5.6-1	—
Debian 13	linux	6.5.6-1	—
Debian 12	linux	6.1.190-1	—

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu Nvidia-BlueField 22.04 LTS	linux-bluefield	5.15.0-1051.53	—
Ubuntu 24.04 LTS	linux-raspi-realtime	No fix yet	—
Ubuntu 22.04 LTS	linux +1	5.15.0-119.129	USN-6974-1
Ubuntu 22.04 LTS	linux-aws	5.15.0-1068.74	USN-6974-1
Ubuntu 22.04 LTS	linux-azure	5.15.0-1071.80	USN-6974-1
Ubuntu 22.04 LTS	linux-azure-fde	5.15.0-1071.80.1	USN-6974-1
Ubuntu 22.04 LTS	linux-gcp	5.15.0-1067.75	USN-6974-1
Ubuntu 22.04 LTS	linux-gke	5.15.0-1065.71	USN-6974-1
Ubuntu 22.04 LTS	linux-gkeop	5.15.0-1051.58	USN-6974-1
Ubuntu 22.04 LTS	linux-ibm +1	5.15.0-1061.64	USN-6974-1
Ubuntu 22.04 LTS	linux-intel-iotg	5.15.0-1063.69	USN-6974-1
Ubuntu 22.04 LTS	linux-kvm	5.15.0-1065.70	USN-6974-1
Ubuntu 22.04 LTS	linux-nvidia	5.15.0-1063.64	USN-6974-1
Ubuntu 22.04 LTS	linux-nvidia-6.5	6.5.0-1014.14	—
Ubuntu 22.04 LTS	linux-nvidia-tegra	5.15.0-1028.28	—
Ubuntu 22.04 LTS	linux-nvidia-tegra-igx	5.15.0-1016.16	—
Ubuntu 22.04 LTS	linux-oracle	5.15.0-1066.72	USN-6974-1
Ubuntu 22.04 LTS	linux-riscv +28	No fix yet	—
Ubuntu 22.04 LTS	linux-xilinx-zynqmp	5.15.0-1035.39	USN-7019-1
Ubuntu 20.04 LTS	linux	5.4.0-193.213	USN-6973-1
Ubuntu 20.04 LTS	linux-aws	5.4.0-1131.141	USN-6973-1
Ubuntu 20.04 LTS	linux-aws-5.15	5.15.0-1068.74~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-azure	5.4.0-1136.143	USN-6973-1
Ubuntu 20.04 LTS	linux-azure-5.15	5.15.0-1071.80~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-azure-fde-5.15	5.15.0-1071.80~20.04.1.1	USN-6974-1
Ubuntu 20.04 LTS	linux-bluefield	5.4.0-1091.98	USN-6973-1
Ubuntu 20.04 LTS	linux-gcp	5.4.0-1135.144	USN-6973-1
Ubuntu 20.04 LTS	linux-gcp-5.15	5.15.0-1067.75~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-gke +26	No fix yet	—
Ubuntu 20.04 LTS	linux-gkeop	5.4.0-1098.102	USN-6973-1
Ubuntu 20.04 LTS	linux-gkeop-5.15	5.15.0-1051.58~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-hwe-5.15 +1	5.15.0-119.129~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-ibm	5.4.0-1078.83	USN-6973-1
Ubuntu 20.04 LTS	linux-ibm-5.15	5.15.0-1061.64~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-intel-iotg-5.15	5.15.0-1063.69~20.04.1	USN-6974-1
Ubuntu 20.04 LTS	linux-iot	5.4.0-1043.44	USN-7006-1
Ubuntu 20.04 LTS	linux-kvm	5.4.0-1119.127	USN-6973-1
Ubuntu 20.04 LTS	linux-nvidia-tegra-5.15	5.15.0-1030.30~20.04.1	—
Ubuntu 20.04 LTS	linux-oracle	5.4.0-1130.139	USN-6973-1
Ubuntu 20.04 LTS	linux-oracle-5.15	5.15.0-1066.72~20.04.1	USN-6974-2
Ubuntu 20.04 LTS	linux-raspi	5.4.0-1115.127	USN-6973-1
Ubuntu 20.04 LTS	linux-riscv-5.15	5.15.0-1064.68~20.04.1	—
Ubuntu 20.04 LTS	linux-xilinx-zynqmp	5.4.0-1050.54	USN-6973-1
Ubuntu 18.04 LTS	linux-gcp +14	No fix yet	—

Show 13 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Ubuntu 16.04 LTS	linux-hwe-edge	No fix yet	—
Ubuntu Pro Realtime 22.04 LTS	linux-intel-iot-realtime	5.15.0-1061.63	—
Ubuntu Pro Realtime 22.04 LTS	linux-realtime	5.15.0-1069.77	—
Ubuntu Pro FIPS 20.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro FIPS 18.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro FIPS 16.04 LTS	linux-fips	No fix yet	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-aws-fips	5.15.0-1068.74+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-azure-fips	5.15.0-1071.80+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-fips	5.15.0-119.129+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-gcp-fips	5.15.0-1067.75+fips1	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-aws-fips	5.4.0-1131.141+fips1	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-azure-fips	5.4.0-1136.143+fips1	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-fips	5.4.0-1105.115	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-gcp-fips	5.4.0-1135.144+fips1	—
Ubuntu Pro FIPS-updates 18.04 LTS	linux-aws-fips	4.15.0-2110.116	—
Ubuntu Pro FIPS-updates 18.04 LTS	linux-azure-fips	4.15.0-2089.95	—
Ubuntu Pro FIPS-updates 18.04 LTS	linux-fips	4.15.0-1126.137	—
Ubuntu Pro FIPS-updates 18.04 LTS	linux-gcp-fips	4.15.0-2073.78	—
Ubuntu Pro FIPS-updates 16.04 LTS	linux-fips	4.4.0-1104.111	—
Ubuntu Pro FIPS-preview 22.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro 18.04 LTS	linux	4.15.0-228.240	USN-6972-1
Ubuntu Pro 18.04 LTS	linux-aws	4.15.0-1172.185	USN-6972-2
Ubuntu Pro 18.04 LTS	linux-aws-5.4	5.4.0-1131.141~18.04.1	USN-6973-3
Ubuntu Pro 18.04 LTS	linux-azure-4.15	4.15.0-1180.195	USN-6972-3
Ubuntu Pro 18.04 LTS	linux-azure-5.4	5.4.0-1136.143~18.04.1	USN-6973-2
Ubuntu Pro 18.04 LTS	linux-gcp-4.15	4.15.0-1165.182	USN-6972-1
Ubuntu Pro 18.04 LTS	linux-gcp-5.4	5.4.0-1135.144~18.04.1	USN-6973-1
Ubuntu Pro 18.04 LTS	linux-hwe-5.4	5.4.0-193.213~18.04.1	USN-6973-1
Ubuntu Pro 18.04 LTS	linux-ibm-5.4	5.4.0-1078.83~18.04.1	USN-6973-1
Ubuntu Pro 18.04 LTS	linux-kvm	4.15.0-1155.160	USN-6972-1
Ubuntu Pro 18.04 LTS	linux-oracle	4.15.0-1134.145	USN-6972-4
Ubuntu Pro 18.04 LTS	linux-oracle-5.4	5.4.0-1130.139~18.04.1	USN-6973-1
Ubuntu Pro 18.04 LTS	linux-raspi-5.4	5.4.0-1115.127~18.04.1	USN-6973-4
Ubuntu Pro 16.04 LTS	linux	4.4.0-258.292	USN-6976-1
Ubuntu Pro 16.04 LTS	linux-aws	4.4.0-1173.188	USN-6976-1
Ubuntu Pro 16.04 LTS	linux-aws-hwe	4.15.0-1172.185~16.04.1	USN-6972-2
Ubuntu Pro 16.04 LTS	linux-azure	4.15.0-1180.195~16.04.1	USN-6972-3
Ubuntu Pro 16.04 LTS	linux-gcp	4.15.0-1165.182~16.04.1	USN-6972-1
Ubuntu Pro 16.04 LTS	linux-hwe	4.15.0-228.240~16.04.1	USN-6972-1
Ubuntu Pro 16.04 LTS	linux-kvm	4.4.0-1136.146	USN-6976-1
Ubuntu Pro 16.04 LTS	linux-oracle	4.15.0-1134.145~16.04.1	USN-6972-4
Ubuntu Pro 14.04 LTS	linux	No fix yet	—
Ubuntu Pro 14.04 LTS	linux-aws	4.4.0-1135.141	USN-6976-1
Ubuntu Pro 14.04 LTS	linux-azure	4.15.0-1180.195~14.04.1	USN-6972-3
Ubuntu Pro 14.04 LTS	linux-lts-xenial	4.4.0-258.292~14.04.2	USN-6976-1

Advisories 14

USN-7006-1 linux-iot vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
USN-7019-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
USN-6972-1 linux, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6974-2 linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6976-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6973-1 linux, linux-aws, linux-azure, linux-bluefield, linux-gcp, linux-gcp-5.4, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6974-1 linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15, linux-azure-fde, linux-azure-fde-5.15, linux-gcp, linux-gcp-5.15, linux-gke, linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iotg, linux-intel-iotg-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6973-2 linux-azure-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6972-2 linux-aws, linux-aws-hwe vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6972-3 linux-azure, linux-azure-4.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6973-4 linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6972-4 linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
USN-6973-3 linux-aws-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
WID-SEC-2024-0749 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026

References