Kernel crash via Device Mapper resume-remove race
Published Sep 16, 2026 · Updated Sep 16, 2026
A concurrency flaw in Linux Device Mapper allows local users to crash the kernel by racing resume and remove ioctls on one device. The resume path checks that the device is suspended but fails to reject DMF_FREEING, so it can reactivate targets after __dm_destroy suspends them and before their table is destroyed. Exploitation requires CAP_SYS_ADMIN access to /dev/mapper/control and a configured target such as dm-integrity; the stale reboot notifier can trigger a use-after-free and kernel panic.
Summary
What happened
A concurrency flaw in Linux Device Mapper allows local users to crash the kernel by racing resume and remove ioctls on one device. The resume path checks that the device is suspended but fails to reject DMF_FREEING, so it can reactivate targets after __dm_destroy suspends them and before their table is destroyed. Exploitation requires CAP_SYS_ADMIN access to /dev/mapper/control and a configured target such as dm-integrity; the stale reboot notifier can trigger a use-after-free and kernel panic.
The record
- CVE
- CVE-2026-89997
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <5.10.270
- Affected versionversion=0 <5.15.221
- Affected versionversion=0 <6.1.188
- Affected versionversion=0 <6.12.110
- Affected versionversion=0 <6.18.51
- Affected versionversion=0 <6.6.157
- Affected versionversion=0 <7.2.5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1ede2bce2bd640605df83db1356fd727159bc9ed
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <36177beff2a9df035991ad8d16ccf8d363ed93ee
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b59530b14fde693e41d8e39bc326df6cbf07b76
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3f04e6520d9a53adb1d1daf4dc5d31a60fc77d1f
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44b43ec132f1cf3275ecc182d0c82f50c3c4c3d5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94380ecd5ff9b2a2b9f6e8a0b5c465159ccfaf71
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94f3d399c1ddba763c1c5a6501f7375d533d789f
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9757367bcf1d5d2c50b94d005abca21f3eedd7c3
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- dm-integrity resume-versus-remove race reproducerfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo