VulnerabilityPublished 24 Dec 2025Updated 21 Oct 2026

CVE-2025-68368: Linux kernel · md: init bioset in mddev_init

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 903fb4851ee8d291372d285f616c398a9c4cbbec : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 903fb4851ee8d291372d285f616c398a9c4cbbec, 381a3ce1c0ffed647c9b913e142b099c7e9d5afc, 9d37fe37dfa0833a8768740f0575e0ffd793cb4a

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to 903fb4851ee8d291372d285f616c398a9c4cbbec, 381a3ce1c0ffed647c9b913e142b099c7e9d5afc or 9d37fe37dfa0833a8768740f0575e0ffd793cb4a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 903fb4851ee8d291372d285f616c398a9c4cbbec	Fixed in 903fb4851ee8d291372d285f616c398a9c4cbbec
LinuxLinux	Affected ≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 381a3ce1c0ffed647c9b913e142b099c7e9d5afc	Fixed in 381a3ce1c0ffed647c9b913e142b099c7e9d5afc
LinuxLinux	Affected ≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 9d37fe37dfa0833a8768740f0575e0ffd793cb4a	Fixed in 9d37fe37dfa0833a8768740f0575e0ffd793cb4a
LinuxLinux	Affected =6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: md: init bioset in mddev_init IO operations may be needed before md_run(), such as updating metadata after writing sysfs. Without bioset, this triggers a NULL pointer dereference as below: BUG: kernel NULL pointer dereference, address: 0000000000000020 Call Trace: md_update_sb+0x658/0xe00 new_level_store+0xc5/0x120 md_attr_store+0xc9/0x1e0 sysfs_kf_write+0x6f/0xa0 kernfs_fop_write_iter+0x141/0x2a0 vfs_write+0x1fc/0x5a0 ksys_write+0x79/0x180 __x64_sys_write+0x1d/0x30 x64_sys_call+0x2818/0x2880 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Reproducer ``` mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd] echo inactive > /sys/block/md0/md/array_state echo 10 > /sys/block/md0/md/new_level ``` mddev_init() can only be called once per mddev, no need to test if bioset has been initialized anymore.

References

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