DaystoPatch

Linux kernelExploited incident

Linux kernel posix-cpu-timers race (CVE-2025-38352), exploited on Android

CVE-2025-38352High, CVSS 7.8In CISA's Known Exploited Vulnerabilities catalog since 4 Sep 2025

  • Exploited after a fix existed
FixedFixed for every supported version on the day it became public.

Response

Silence
0h
First public report to first vendor statement
Exposure
0h
First public report to first fix
Follow-through
0h
First public report to a fix for every supported version
  • Vendor silent
  • Vendor statement, no fix
  • Fixed for some versions
  • Fixed when disclosed
  • Date only, no time of day

Timeline and evidence

Open a moment to see its source and archived quote.

  1. First public report

    CVE-2025-38352 record (CNA: Linux)CuratedQuote verified

    "datePublished":"2025-07-22T08:04:25.277Z"

    CVE title: 'posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()'.

    Recorded time
    Precision
    To the minute
    Origin
    Curated. Found by a researcher, with a verbatim quote and link.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:20cf832f050c1a2f…
    Used in metrics
    Yes
    Dispute this timestamp
    3 more sources for this moment
    CVE.org record CVE-2025-38352ClaimedQuote verified22 Jul 2025, 08:04 UTC

    In the Linux kernel, the following vulnerability has been resolved:

    CVE record published.

    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:20cf832f050c1a2f…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Bluesky postClaimedQuote not checked yet22 Jul 2025, 09:10 UTC

    You can now share your thoughts on vulnerability CVE-2025-38352 in Vulnerability-Lookup:

    Earliest third-party post we hold.

    Source
    Bluesky post social
    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Not checked yet
    Snapshot
    No archived snapshot
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    CISA KEV (CVE-2025-38352)ClaimedQuote verified4 Sep 2025

    Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability

    Added to CISA's KEV catalog on 2025-09-04.

    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:ef8fffede5c47200…
    Used in metrics
    No, kept for the record
    Dispute this timestamp

  2. Vendor statement

    at disclosure

    CVE-2025-38352 record (CNA: Linux)CuratedQuote verified

    "datePublished":"2025-07-22T08:04:25.277Z"

    Recorded time
    Precision
    To the minute
    Origin
    Curated. Found by a researcher, with a verbatim quote and link.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:20cf832f050c1a2f…
    Used in metrics
    Yes
    Dispute this timestamp

  3. First workaround

    No official mitigation found yet.

  4. First fix

    at disclosure

    kernel.org ChangeLog-6.6.94CuratedQuote verified

    Date: Thu Jun 19 15:28:47 2025 +0200

    Top entry of the Linux 6.6.94 ChangeLog is the release commit 'Linux 6.6.94' dated Thu Jun 19 15:28:47 2025 +0200 = 2025-06-19 13:28 UTC (commit author date). First fixed releases (6.6.94, 6.12.34, 6.15.3 on 2025-06-19).

    Source
    kernel.org ChangeLog-6.6.94 vendor github
    Recorded time
    Precision
    To the minute
    Origin
    Curated. Found by a researcher, with a verbatim quote and link.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:ac284fc5cdc6faba…
    Used in metrics
    Yes
    Dispute this timestamp

  5. Fixed for all versions

    at disclosure

    kernel.org ChangeLog-6.1.142CuratedQuote verified

    Date: Fri Jun 27 11:07:41 2025 +0100

    Top entry of the Linux 6.1.142 ChangeLog is the release commit 'Linux 6.1.142' dated Fri Jun 27 11:07:41 2025 +0100 = 2025-06-27 10:07 UTC (commit author date). 5.4.295, 5.10.239, 5.15.186 and 6.1.142 followed on 2025-06-27; 6.1.142 was the last.

    Source
    kernel.org ChangeLog-6.1.142 vendor github
    Recorded time
    Precision
    To the minute
    Origin
    Curated. Found by a researcher, with a verbatim quote and link.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:dacb57fe555e39c4…
    Used in metrics
    Yes
    Dispute this timestamp

Send this to your boss

No brief for this incident yet. We write one for every open incident and every critical bug exploited before a fix.

Affected products

  • Linux kernel 2.6.36 up to 5.4.294, 5.10.238, 5.15.185, 6.1.141, 6.6.93, 6.12.33, 6.15.2 (posix-cpu-timers)
How we built this timeline

Kernel moment model: vendor/world = the kernel CNA's CVE publication (first security-labelled public signal); First fix = first stable or mainline release containing the fix (R2: counts even though it precedes the CVE);

Fixed for all versions = the last of the stable/LTS releases the CVE record lists as fixed (R6: provided every then-supported affected line is listed). Release dates come from kernel.org ChangeLog files.

The fix is normally public in stable releases before the CVE is published, so exposure is zero. Downstream lag (Android, distributions) is not graded here.

Exploitation was reported after the upstream fix: Google's Android Security Bulletin of September 2025 flagged CVE-2025-38352 as possibly under limited, targeted exploitation, and CISA added it to KEV on 4 Sep 2025. When exploitation began is not public; exploited before a fix=false reflects that no exploitation report predates the upstream fix.

CVSS 7.8 from the kernel CNA record.

Related

No related incidents.

Linux kernel report card