CVE-2026-53061: Linux kernel · dm cache: fix dirty mapping checking in passthrough mode switching
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:34 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d, bd5a2c1018938e6b32670728bdb32a3f0efff00f, 322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Description
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix dirty mapping checking in passthrough mode switching As mentioned in commit 9b1cc9f251af ("dm cache: share cache-metadata object across inactive and active DM tables"), dm-cache assumed table reload occurs after suspension, while LVM's table preload breaks this assumption. The dirty mapping check for passthrough mode was designed around this assumption and is performed during table creation, causing the check to fail with preload while metadata updates are ongoing. This risks loading dirty mappings into passthrough mode, resulting in data loss. Reproduce steps: 1. Create a writeback cache with zero migration_threshold to produce dirty mappings 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 writeback smq \ 2 migration_threshold 0" 2. Preload a table in passthrough mode dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0" 3. Write to the first cache block to make it dirty fio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \ --direct=1 --size=64k 4. Resume the inactive table. Now it's possible to load the dirty block into passthrough mode. dmsetup resume cache Fix by moving the checks to the preresume phase to support table preloading. Also remove the unused function dm_cache_metadata_all_clean.
References
- git.kernel.org/stable/c/c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d (opens in a new tab)
- git.kernel.org/stable/c/5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc (opens in a new tab)
- git.kernel.org/stable/c/1443c32f24d6d8bcdf4beceef2afc09290b98717 (opens in a new tab)
- git.kernel.org/stable/c/12105c7f18375d7615dad7605d89eadae7eb12a6 (opens in a new tab)
- git.kernel.org/stable/c/bd5a2c1018938e6b32670728bdb32a3f0efff00f (opens in a new tab)
- git.kernel.org/stable/c/21c503d60a257e54ca3ac58e2721bd24501d5bde (opens in a new tab)
- git.kernel.org/stable/c/01b22656d8a68dbeae59f8b80866e7b11936b20a (opens in a new tab)
- git.kernel.org/stable/c/322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8 (opens in a new tab)