CVE-2026-53062High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: fix missing locks in invalidating cache blocks In passthrough mode, the policy invalidate_mapping operation is called simultaneously from multiple…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.10%
Last analysed / modified upstream
7.8 → 7
7 → 7.8
In the Linux kernel, the following vulnerability has been resolved:
dm cache policy smq: fix missing locks in invalidating cache blocks
In passthrough mode, the policy invalidate_mapping operation is called simultaneously from multiple workers, thus it should be protected by a lock. Otherwise, we might end up with data races on the allocated blocks counter, or even use-after-free issues with internal data structures when doing concurrent writes.
Note that the existing FIXME in smq_invalidate_mapping() doesn't affect passthrough mode since migration tasks don't exist there, but would need attention if supporting fast device shrinking via suspend/resume without target reloading.
Reproduce steps:
dmsetup create cmeta --table "0 8192 linear /dev/sdc 0"
dmsetup create cdata --table "0 131072 linear /dev/sdc 8192"
dmsetup create corig --table "0 262144 linear /dev/sdc 262144"
dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct
dmsetup create cache --table "0 262144 cache /dev/mapper/cmeta
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0"
fio --name=populate --filename=/dev/mapper/cache --rw=randwrite --bs=4k
--size=64m --direct=1
nr_cached=$(dmsetup status cache | awk '{split($7, a, "/"); print a[1]}')
dmsetup suspend cache
dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0"
dmsetup resume cache
fio --filename=/dev/mapper/cache --name=test --rw=randwrite --bs=64k
--direct=1 --numjobs=2 --randrepeat=0 --size=64m
nr_demoted=$(dmsetup status cache | awk '{print $12}') echo "$nr_cached, $nr_demoted"
Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 4991b5a08751e2e82488fb93ae08849b6aea10d9Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130eLinux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < ac5ee99443891bdb161f5539606a66a1b5e72542Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 93627a29d4b66d4a2def938dfb8610cc80ae454bLinux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < c348ae47d8e65f06429fa41adce9ad986b696766Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 2b62d0611c9af14a16bddf22df2612b4f40eb5a1Linux >= b29d4986d0da1a27cd35917cdb433672f5c95d7f < 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45Linux 4.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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