Ubuntu: (Multiple Advisories) (CVE-2024-36961): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: thermal/debugfs: Fix two locking issues with thermal zone debug With the current thermal zone locking arrangement in the debugfs code, user space can open the "mitigations" file for a thermal zone before the zone's debugfs pointer is set which will result in a NULL pointer dereference in tze_seq_start(). Moreover, thermal_debug_tz_remove() is not called under the thermal zone lock, so it can run in parallel with the other functions accessing the thermal zone's struct thermal_debugfs object. Then, it may clear tz->debugfs after one of those functions has checked it and the struct thermal_debugfs object may be freed prematurely. To address the first problem, pass a pointer to the thermal zone's struct thermal_debugfs object to debugfs_create_file() in thermal_debug_tz_add() and make tze_seq_start(), tze_seq_next(), tze_seq_stop(), and tze_seq_show() retrieve it from s->private instead of a pointer to the thermal zone object. This will ensure that tz_debugfs will be valid across the "mitigations" file accesses until thermal_debugfs_remove_id() called by thermal_debug_tz_remove() removes that file. To address the second problem, use tz->lock in thermal_debug_tz_remove() around the tz->debugfs value check (in case the same thermal zone is removed at the same time in two different threads) and its reset to NULL. Cc :6.8+ <stable@vger.kernel.org> # 6.8+
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1008-gke
- ubuntu-upgrade-linux-image-6-8-0-1009-raspi
- ubuntu-upgrade-linux-image-6-8-0-1010-ibm
- ubuntu-upgrade-linux-image-6-8-0-1010-oem
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1012-gcp
- ubuntu-upgrade-linux-image-6-8-0-1013-aws
- ubuntu-upgrade-linux-image-6-8-0-40-generic
- ubuntu-upgrade-linux-image-6-8-0-40-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-6-8
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-64k-6-8
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem-24-04
- ubuntu-upgrade-linux-image-oem-24-04a
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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