Ubuntu: (Multiple Advisories) (CVE-2024-42234): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: mm: fix crashes from deferred split racing folio migration Even on 6.10-rc6, I've been seeing elusive "Bad page state"s (often on flags when freeing, yet the flags shown are not bad: PG_locked had been set and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from deferred_split_scan()'s folio_put(), and a variety of other BUG and WARN symptoms implying double free by deferred split and large folio migration. 6.7 commit 9bcef5973e31 ("mm: memcg: fix split queue list crash when large folio migration") was right to fix the memcg-dependent locking broken in 85ce2c517ade ("memcontrol: only transfer the memcg data for migration"), but missed a subtlety of deferred_split_scan(): it moves folios to its own local list to work on them without split_queue_lock, during which time folio->_deferred_list is not empty, but even the "right" lock does nothing to secure the folio and the list it is on. Fortunately, deferred_split_scan() is careful to use folio_try_get(): so folio_migrate_mapping() can avoid the race by folio_undo_large_rmappable() while the old folio's reference count is temporarily frozen to 0 - adding such a freeze in the !mapping case too (originally, folio lock and unmapping and no swap cache left an anon folio unreachable, so no freezing was needed there: but the deferred split queue offers a way to reach it).
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1013-gke
- ubuntu-upgrade-linux-image-6-8-0-1014-ibm
- ubuntu-upgrade-linux-image-6-8-0-1014-raspi
- ubuntu-upgrade-linux-image-6-8-0-1015-oracle
- ubuntu-upgrade-linux-image-6-8-0-1015-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1016-azure
- ubuntu-upgrade-linux-image-6-8-0-1016-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1016-gcp
- ubuntu-upgrade-linux-image-6-8-0-1016-oem
- ubuntu-upgrade-linux-image-6-8-0-1017-azure
- ubuntu-upgrade-linux-image-6-8-0-1017-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1017-gcp
- ubuntu-upgrade-linux-image-6-8-0-1017-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1018-aws
- ubuntu-upgrade-linux-image-6-8-0-48-generic
- ubuntu-upgrade-linux-image-6-8-0-48-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-48-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-48-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-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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