DaystoPatch

Linux kernelExploited incident

Linux kernel cgroups v1 release_agent privilege escalation / container escape (CVE-2022-0492)

CVE-2022-0492High, CVSS 7.8In CISA's Known Exploited Vulnerabilities catalog since 2 Jun 2026

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

Response

Silence
not dated
First public report to first vendor statement
Exposure
same day
First public report to first fix
Follow-through
same day
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

    date only

    CVE-2022-0492 record (CNA: redhat)CuratedQuote verified

    "datePublished":"2022-03-03T00:00:00.000Z"

    The record carries a midnight timestamp, i.e. a date only, so day precision.

    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Curated. Found by a researcher, with a verbatim quote and link.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:81c52aa8b9abe12c…
    Used in metrics
    Yes
    Dispute this timestamp
    4 more sources for this moment
    CVE.org record CVE-2022-0492ClaimedQuote verified3 Mar 2022, 00:00 UTC

    A vulnerability was found in the Linux kernel’s cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1

    CVE record published.

    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:81c52aa8b9abe12c…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Hacker NewsClaimedQuote not checked yet4 Mar 2022, 15:35 UTC

    https://unit42.paloaltonetworks.com/cve-2022-0492-cgroups/

    Earliest third-party post we hold.

    Source
    Hacker News hn
    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
    Bluesky postClaimedQuote not checked yet13 Mar 2026, 14:10 UTC

    🔗 CVE : CVE-2021-33909, CVE-2021-35942, CVE-2022-0492, CVE-2022-2309, CVE-2022-23218, CVE-2022-23219, CVE-2022-28893, CVE-2022-30594, CVE-2023-3341, CVE-2023-44487, CVE-2024-26633, CVE-2024-26641

    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-2022-0492)ClaimedQuote verified2 Jun 2026

    Linux Kernel Improper Authentication Vulnerability

    Added to CISA's KEV catalog on 2026-06-02.

    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

    No public statement from the vendor found yet.

  3. First workaround

    No official mitigation found yet.

  4. First fix

    same day

    kernel.org ChangeLog-5.4.177CuratedQuote verified

    Date: Sat Feb 5 12:35:37 2022 +0100

    Top entry of the Linux 5.4.177 ChangeLog is the release commit 'Linux 5.4.177' dated Sat Feb 5 12:35:37 2022 +0100 = 2022-02-05 11:35 UTC (commit author date). Stable backports 5.16.6, 5.15.20, 5.10.97 and 5.4.177 were tagged on 2022-02-05 (commit 24f600856418 'cgroup-v1: Require capabilities to set release_agent').

    Source
    kernel.org ChangeLog-5.4.177 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
    sha256:4ccb4cf10889c306…
    Used in metrics
    Yes
    Dispute this timestamp

  5. Fixed for all versions

    same day

    kernel.org ChangeLog-4.19.229CuratedQuote verified

    Date: Fri Feb 11 08:44:59 2022 +0100

    Top entry of the Linux 4.19.229 ChangeLog is the release commit 'Linux 4.19.229' dated Fri Feb 11 08:44:59 2022 +0100 = 2022-02-11 07:44 UTC (commit author date). 4.19.229, 4.14.266 and 4.9.301 followed on 2022-02-11.

    Source
    kernel.org ChangeLog-4.19.229 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:a6c052770350c6af…
    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 2.6.24 up to 4.9.300, 4.14.265, 4.19.228, 5.4.176, 5.10.96, 5.15.19, 5.16.5 (kernel/cgroup/cgroup-v1.c)
How we built this timeline

Coordinated disclosure: fixed in stable releases in early February 2022, CVE published 3 Mar 2022, KEV-listed 2 Jun 2026. No Vendor statement moment is recorded: before the kernel became a CNA (2024) the upstream kernel published no security advisories, and the fixing releases do not describe the bug as a vulnerability.

Fixed-version mapping per branch is from the linuxkernelcves.com dataset (raw.githubusercontent.com/nluedtke/linux_kernel_cves data/stream_fixes.json) and NVD's CPE ranges; release dates are from the kernel.org ChangeLog files (git.kernel.org tag pages were used before the 23 Oct 2026 correction pass; robots.txt blocks them). No report of exploitation before the fix.

CVSS 7.8 is the NVD / CISA-ADP score (the Red Hat CNA record has none).

Related

Linux kernel report card