7.8

CVE-2025-22126: md: fix mddev uaf while iterating all_mddevs list

Modified
AliasesUBUNTU-CVE-2025-22126DEBIAN-CVE-2025-22126
Published 16-04-2025Last modified 11-05-2026

Vulnerability summary

CVE-2025-22126 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.20%
0%100%
Low · 0.00 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 36 · Related 30
DLA-4193-1DSA-5907-1RHSA-2025:10536RHSA-2025:10547RHSA-2025:10701RHSA-2025:9080

Timeline

  1. 16-04-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: md: fix mddev uaf while iterating all_mddevs list While iterating all_mddevs list from md_notify_reboot() and md_exit(), list_for_each_entry_safe is used, and this can race with deletint the next mddev, causing UAF: t1: spin_lock //list_for_each_entry_safe(mddev, n, ...) mddev_get(mddev1) // assume mddev2 is the next entry spin_unlock t2: //remove mddev2 ... mddev_free spin_lock list_del spin_unlock kfree(mddev2) mddev_put(mddev1) spin_lock //continue dereference mddev2->all_mddevs The old helper for_each_mddev() actually grab the reference of mddev2 while holding the lock, to prevent from being freed. This problem can be fixed the same way, however, the code will be complex. Hence switch to use list_for_each_entry, in this case mddev_put() can free the mddev1 and it's not safe as well. Refer to md_seq_show(), also factor out a helper mddev_put_locked() to fix this problem.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.20% 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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu112 products
  • linux< 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f26514342255855f4ca3c0a92cb1cdea01c33004, < ca9f84de76723b358dfc0606668efdca54afc2e5 | ≥ f26514342255855f4ca3c0a92cb1cdea01c33004, < d69a23d8e925f8052d657652a6875ec2712c7e33 | ≥ f26514342255855f4ca3c0a92cb1cdea01c33004, < e2a9f73ee408a460f4c9dfe03b4741d6b11652b8 | ≥ f26514342255855f4ca3c0a92cb1cdea01c33004, < 5462544ccbad3fc938a71b01fa5bd3a0dc2b750a | ≥ f26514342255855f4ca3c0a92cb1cdea01c33004, < 8542870237c3a48ff049b6c5df5f50c8728284fa | 6.0
  • linux_kernel≥ 6.0, < 6.1.135 | ≥ 6.2, < 6.6.88 | ≥ 6.7, < 6.12.25 | ≥ 6.13, < 6.14.2
Debian1 product
  • linux< 6.1.135-1 | < 6.12.22-1

3 vendors · 115 products

References

30 links
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