Ubuntu: (Multiple Advisories) (CVE-2024-42316): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: mm/mglru: fix div-by-zero in vmpressure_calc_level() evict_folios() uses a second pass to reclaim folios that have gone through page writeback and become clean before it finishes the first pass, since folio_rotate_reclaimable() cannot handle those folios due to the isolation. The second pass tries to avoid potential double counting by deducting scan_control->nr_scanned. However, this can result in underflow of nr_scanned, under a condition where shrink_folio_list() does not increment nr_scanned, i.e., when folio_trylock() fails. The underflow can cause the divisor, i.e., scale=scanned+reclaimed in vmpressure_calc_level(), to become zero, resulting in the following crash: [exception RIP: vmpressure_work_fn+101] process_one_work at ffffffffa3313f2b Since scan_control->nr_scanned has no established semantics, the potential double counting has minimal risks. Therefore, fix the problem by not deducting scan_control->nr_scanned in evict_folios().
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1002-gkeop
- ubuntu-upgrade-linux-image-6-8-0-1015-gke
- ubuntu-upgrade-linux-image-6-8-0-1016-raspi
- ubuntu-upgrade-linux-image-6-8-0-1017-ibm
- ubuntu-upgrade-linux-image-6-8-0-1017-oracle
- ubuntu-upgrade-linux-image-6-8-0-1017-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1018-oem
- ubuntu-upgrade-linux-image-6-8-0-1019-gcp
- ubuntu-upgrade-linux-image-6-8-0-1019-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1019-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1019-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1019-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1020-aws
- ubuntu-upgrade-linux-image-6-8-0-1020-azure
- ubuntu-upgrade-linux-image-6-8-0-1020-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-50-generic
- ubuntu-upgrade-linux-image-6-8-0-50-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-50-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-50-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-22-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-gkeop
- ubuntu-upgrade-linux-image-gkeop-6-8
- 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-lowlatency-64k-hwe-22-04
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-24-04
- 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-64k-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem-22-04
- ubuntu-upgrade-linux-image-oem-22-04a
- ubuntu-upgrade-linux-image-oem-22-04b
- ubuntu-upgrade-linux-image-oem-22-04c
- ubuntu-upgrade-linux-image-oem-22-04d
- 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-22-04
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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