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Test your applicationsUpgrade RHEL:9
kernel-64k-modules-core
to version 0:5.14.0-284.11.1.el9_2 or higher.
This issue was patched in RHSA-2023:2458
.
Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-core
package and not the kernel-64k-modules-core
package as distributed by RHEL
.
See How to fix?
for RHEL:9
relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
writeback: avoid use-after-free after removing device
When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback.
Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work.
Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.