VULNERABILITY

Ubuntu: (Multiple Advisories) (CVE-2025-21694): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2025-21694): Linux kernel vulnerabilities

Severity

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

02/12/2025

Created

03/29/2025

Added

03/28/2025

Modified

05/29/2025

Description

In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups.

Solution(s)

ubuntu-upgrade-linux-image-5-15-0-1021-nvidia-tegra-igx
ubuntu-upgrade-linux-image-5-15-0-1021-nvidia-tegra-igx-rt
ubuntu-upgrade-linux-image-5-15-0-1033-nvidia-tegra
ubuntu-upgrade-linux-image-5-15-0-1033-nvidia-tegra-rt
ubuntu-upgrade-linux-image-5-15-0-1044-xilinx-zynqmp
ubuntu-upgrade-linux-image-5-15-0-1062-gkeop
ubuntu-upgrade-linux-image-5-15-0-1072-ibm
ubuntu-upgrade-linux-image-5-15-0-1073-intel-iot-realtime
ubuntu-upgrade-linux-image-5-15-0-1074-ibm
ubuntu-upgrade-linux-image-5-15-0-1074-nvidia
ubuntu-upgrade-linux-image-5-15-0-1074-nvidia-lowlatency
ubuntu-upgrade-linux-image-5-15-0-1074-raspi
ubuntu-upgrade-linux-image-5-15-0-1075-intel-iotg
ubuntu-upgrade-linux-image-5-15-0-1076-kvm
ubuntu-upgrade-linux-image-5-15-0-1077-gke
ubuntu-upgrade-linux-image-5-15-0-1077-intel-iotg
ubuntu-upgrade-linux-image-5-15-0-1077-oracle
ubuntu-upgrade-linux-image-5-15-0-1079-gcp
ubuntu-upgrade-linux-image-5-15-0-1079-gcp-fips
ubuntu-upgrade-linux-image-5-15-0-1080-aws
ubuntu-upgrade-linux-image-5-15-0-1080-aws-fips
ubuntu-upgrade-linux-image-5-15-0-1080-realtime
ubuntu-upgrade-linux-image-5-15-0-1081-gcp
ubuntu-upgrade-linux-image-5-15-0-1083-azure-fips
ubuntu-upgrade-linux-image-5-15-0-1084-azure
ubuntu-upgrade-linux-image-5-15-0-1086-azure
ubuntu-upgrade-linux-image-5-15-0-1086-azure-fde
ubuntu-upgrade-linux-image-5-15-0-135-fips
ubuntu-upgrade-linux-image-5-15-0-135-generic
ubuntu-upgrade-linux-image-5-15-0-135-generic-64k
ubuntu-upgrade-linux-image-5-15-0-135-generic-lpae
ubuntu-upgrade-linux-image-5-15-0-135-lowlatency
ubuntu-upgrade-linux-image-5-15-0-135-lowlatency-64k
ubuntu-upgrade-linux-image-5-15-0-136-generic
ubuntu-upgrade-linux-image-5-15-0-136-generic-64k
ubuntu-upgrade-linux-image-5-15-0-136-generic-lpae
ubuntu-upgrade-linux-image-5-4-0-1048-iot
ubuntu-upgrade-linux-image-5-4-0-1060-xilinx-zynqmp
ubuntu-upgrade-linux-image-5-4-0-1088-ibm
ubuntu-upgrade-linux-image-5-4-0-1090-ibm
ubuntu-upgrade-linux-image-5-4-0-1101-bluefield
ubuntu-upgrade-linux-image-5-4-0-1116-fips
ubuntu-upgrade-linux-image-5-4-0-1129-kvm
ubuntu-upgrade-linux-image-5-4-0-1129-raspi
ubuntu-upgrade-linux-image-5-4-0-1140-oracle
ubuntu-upgrade-linux-image-5-4-0-1142-aws
ubuntu-upgrade-linux-image-5-4-0-1142-aws-fips
ubuntu-upgrade-linux-image-5-4-0-1145-gcp
ubuntu-upgrade-linux-image-5-4-0-1145-gcp-fips
ubuntu-upgrade-linux-image-5-4-0-1147-azure
ubuntu-upgrade-linux-image-5-4-0-1147-azure-fips
ubuntu-upgrade-linux-image-5-4-0-211-generic
ubuntu-upgrade-linux-image-5-4-0-211-generic-lpae
ubuntu-upgrade-linux-image-5-4-0-211-lowlatency
ubuntu-upgrade-linux-image-6-11-0-1008-realtime
ubuntu-upgrade-linux-image-6-11-0-1011-raspi
ubuntu-upgrade-linux-image-6-11-0-1012-aws
ubuntu-upgrade-linux-image-6-11-0-1012-lowlatency
ubuntu-upgrade-linux-image-6-11-0-1012-lowlatency-64k
ubuntu-upgrade-linux-image-6-11-0-1013-azure
ubuntu-upgrade-linux-image-6-11-0-1013-azure-fde
ubuntu-upgrade-linux-image-6-11-0-1013-gcp
ubuntu-upgrade-linux-image-6-11-0-1013-gcp-64k
ubuntu-upgrade-linux-image-6-11-0-1014-oracle
ubuntu-upgrade-linux-image-6-11-0-1014-oracle-64k
ubuntu-upgrade-linux-image-6-11-0-1020-oem
ubuntu-upgrade-linux-image-6-11-0-24-generic
ubuntu-upgrade-linux-image-6-11-0-24-generic-64k
ubuntu-upgrade-linux-image-aws
ubuntu-upgrade-linux-image-aws-fips
ubuntu-upgrade-linux-image-aws-lts-20-04
ubuntu-upgrade-linux-image-aws-lts-22-04
ubuntu-upgrade-linux-image-azure
ubuntu-upgrade-linux-image-azure-cvm
ubuntu-upgrade-linux-image-azure-fde
ubuntu-upgrade-linux-image-azure-fips
ubuntu-upgrade-linux-image-azure-lts-20-04
ubuntu-upgrade-linux-image-azure-lts-22-04
ubuntu-upgrade-linux-image-bluefield
ubuntu-upgrade-linux-image-fips
ubuntu-upgrade-linux-image-gcp
ubuntu-upgrade-linux-image-gcp-64k
ubuntu-upgrade-linux-image-gcp-fips
ubuntu-upgrade-linux-image-gcp-lts-20-04
ubuntu-upgrade-linux-image-gcp-lts-22-04
ubuntu-upgrade-linux-image-generic
ubuntu-upgrade-linux-image-generic-64k
ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
ubuntu-upgrade-linux-image-generic-hwe-18-04
ubuntu-upgrade-linux-image-generic-hwe-20-04
ubuntu-upgrade-linux-image-generic-hwe-24-04
ubuntu-upgrade-linux-image-generic-lpae
ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
ubuntu-upgrade-linux-image-gke
ubuntu-upgrade-linux-image-gke-5-15
ubuntu-upgrade-linux-image-gkeop
ubuntu-upgrade-linux-image-gkeop-5-15
ubuntu-upgrade-linux-image-ibm
ubuntu-upgrade-linux-image-ibm-lts-20-04
ubuntu-upgrade-linux-image-intel
ubuntu-upgrade-linux-image-intel-iot-realtime
ubuntu-upgrade-linux-image-intel-iotg
ubuntu-upgrade-linux-image-kvm
ubuntu-upgrade-linux-image-lowlatency
ubuntu-upgrade-linux-image-lowlatency-64k
ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04
ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
ubuntu-upgrade-linux-image-lowlatency-hwe-24-04
ubuntu-upgrade-linux-image-nvidia
ubuntu-upgrade-linux-image-nvidia-lowlatency
ubuntu-upgrade-linux-image-nvidia-tegra
ubuntu-upgrade-linux-image-nvidia-tegra-igx
ubuntu-upgrade-linux-image-nvidia-tegra-igx-rt
ubuntu-upgrade-linux-image-nvidia-tegra-rt
ubuntu-upgrade-linux-image-oem
ubuntu-upgrade-linux-image-oem-20-04
ubuntu-upgrade-linux-image-oem-20-04b
ubuntu-upgrade-linux-image-oem-20-04c
ubuntu-upgrade-linux-image-oem-20-04d
ubuntu-upgrade-linux-image-oem-24-04b
ubuntu-upgrade-linux-image-oem-osp1
ubuntu-upgrade-linux-image-oracle
ubuntu-upgrade-linux-image-oracle-64k
ubuntu-upgrade-linux-image-oracle-lts-20-04
ubuntu-upgrade-linux-image-oracle-lts-22-04
ubuntu-upgrade-linux-image-raspi
ubuntu-upgrade-linux-image-raspi-hwe-18-04
ubuntu-upgrade-linux-image-raspi-nolpae
ubuntu-upgrade-linux-image-raspi2
ubuntu-upgrade-linux-image-realtime
ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
ubuntu-upgrade-linux-image-virtual
ubuntu-upgrade-linux-image-virtual-hwe-18-04
ubuntu-upgrade-linux-image-virtual-hwe-20-04
ubuntu-upgrade-linux-image-virtual-hwe-24-04
ubuntu-upgrade-linux-image-xilinx-zynqmp

References

https://attackerkb.com/topics/cve-2025-21694
CVE - 2025-21694
USN-7387-1
USN-7387-2
USN-7387-3
USN-7388-1
USN-7389-1
USN-7390-1
USN-7391-1
USN-7392-1
USN-7392-2
USN-7392-3
USN-7392-4
USN-7393-1
USN-7401-1
USN-7407-1
USN-7413-1
USN-7421-1
USN-7445-1
USN-7448-1
USN-7458-1
USN-7459-1
USN-7459-2
USN-7463-1
USN-7539-1
USN-7540-1
https://git.kernel.org/linus/cbc5dde0a461240046e8a41c43d7c3b76d5db952
https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a
https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836
https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87
https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713
https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2
https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958
https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952
https://ubuntu.com/security/notices/USN-7387-1
https://ubuntu.com/security/notices/USN-7388-1
https://www.cve.org/CVERecord?id=CVE-2025-21694

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VULNERABILITY

Ubuntu: (Multiple Advisories) (CVE-2025-21694): Linux kernel vulnerabilities

Ubuntu: (Multiple Advisories) (CVE-2025-21694): Linux kernel vulnerabilities

Description

Solution(s)

References

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