CVE-2025-68368: md: init bioset in mddev_init

Deferred
AliasesUBUNTU-CVE-2025-68368DEBIAN-CVE-2025-68368
Published 24-12-2025Last modified 21-10-2026

Vulnerability summary

CVE-2025-68368 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.5% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.21%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 13
OPENSUSE-SU-2026:10039-1OPENSUSE-SU-2026:10301-1OPENSUSE-SU-2026:20287-1SUSE-SU-2026:20555-1SUSE-SU-2026:20570-1SUSE-SU-2026:20599-1

Timeline

  1. 24-12-2025
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu107 products
  • linux< 6.17.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.17.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.115-2 | < 6.18.3-1
Linux1 product
  • linux≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 903fb4851ee8d291372d285f616c398a9c4cbbec | ≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 9d37fe37dfa0833a8768740f0575e0ffd793cb4a | ≥ d981ed8419303ed12351eea8541ad6cb76455fe3, < 381a3ce1c0ffed647c9b913e142b099c7e9d5afc | 6.12

3 vendors · 109 products

References

12 links
Show all 12 references