DaystoPatch

Linux kernelExploited incident

Linux kernel IPv6 fraggap heap overflow, 'ipv6_frag_escape' container escape (CVE-2026-53362)

CVE-2026-53362High, CVSS 7.8In CISA's Known Exploited Vulnerabilities catalog since 27 Aug 2026

  • Exploited after a fix existed
FixedFixed for every supported version 5.6 days after the first public report.

Response

Silence
5.6d
First public report to first vendor statement
Exposure
5.6d
First public report to first fix
Follow-through
5.6d
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

    GitHub repository sgkdev/ipv6_frag_escape (API metadata)CuratedQuote verified

    "created_at":"2026-06-28T22:21:16Z"

    Public working exploit ('Linux LPE - Reliable Jail/Container Escape') published before any stable kernel release contained the fix; Daily CyberSecurity reported it on 2026-06-29 ('Security researcher Massimiliano Oldani has published IPV6_FRAG_ESCAPE, a working proof-of-concept').

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    7 more sources for this moment
    Daily CyberSecurity: Public PoC and Exploit Details Released for IPV6_FRAG_ESCAPE on RHEL 10CuratedQuote verified29 Jun 2026

    Security researcher Massimiliano Oldani has published IPV6_FRAG_ESCAPE, a working proof-of-concept for an IPv6 container escape on CentOS and RHEL 10.

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    CVE.org record CVE-2026-53362ClaimedQuote verified4 Jul 2026, 11:56 UTC

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

    CVE record published.

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    Bluesky postClaimedQuote not checked yet4 Jul 2026, 19:56 UTC

    CVE-2026-53362 - ipv6: account for fraggap on the paged allocation path

    Earliest third-party post we hold.

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    Bluesky post social
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    CISA KEV (CVE-2026-53362)ClaimedQuote verified27 Aug 2026

    Linux Kernel Unspecified Vulnerability

    Added to CISA's KEV catalog on 2026-08-27.

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    Mastodon postClaimedQuote not checked yet27 Aug 2026, 19:00 UTC

    🚨 [CISA-2026:0827] CISA Adds 3 Known Exploited Vulnerabilities to Catalog ( https:// secdb.nttzen.cloud/security-ad visory/detail/CISA-2026:0827 ) CISA has added 3 new vulnerabilities to its Known

    Earliest third-party post we hold.

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    Hacker NewsClaimedQuote not checked yet2 Sep 2026, 16:52 UTC

    https://www.zdnet.com/tech/cve-2026-53362-fraggap-linux-kernel-exploit-openai-incident/

    Earliest third-party post we hold.

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    News: cisa_advisoriesClaimedQuote verified22 Oct 2026

    Siemens SIMATIC S7-1500 TM MFP

    Earliest mention we hold (a vetted outlet).

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  2. Vendor statement

    +5.6d

    CVE-2026-53362 record (CNA: Linux)CuratedQuote verified

    "datePublished":"2026-07-04T11:56:35.864Z"

    CVE title: 'ipv6: account for fraggap on the paged allocation path'. Published minutes after the stable releases.

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  3. First workaround

    No official mitigation found yet.

  4. First fix

    +5.6d

    kernel.org ChangeLog-6.1.177CuratedQuote verified

    Date: Sat Jul 4 13:41:33 2026 +0200

    Top entry of the Linux 6.1.177 ChangeLog is the release commit 'Linux 6.1.177' dated Sat Jul 4 13:41:33 2026 +0200 = 2026-07-04 11:41 UTC (commit author date). First stable releases with the fix (6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, all 2026-07-04). The fix had reached mainline in the 7.2 merge window (7.2-rc1 tagged 2026-06-28 19:01 UTC), a prerelease, which is not counted as a supported fixed release.

    Source
    kernel.org ChangeLog-6.1.177 vendor github
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  5. Fixed for all versions

    +5.6d

    kernel.org ChangeLog-7.1.3CuratedQuote verified

    Date: Sat Jul 4 13:45:09 2026 +0200

    Top entry of the Linux 7.1.3 ChangeLog is the release commit 'Linux 7.1.3' dated Sat Jul 4 13:45:09 2026 +0200 = 2026-07-04 11:45 UTC (commit author date). Last of the 2026-07-04 stable releases; branches before 6.0 are not affected.

    Source
    kernel.org ChangeLog-7.1.3 vendor github
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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 6.0 up to 6.1.176, 6.6.143, 6.12.94, 6.18.37, 7.1.2 (ipv6: __ip6_append_data)
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.

Exception here: a public exploit appeared about 6 days before the first stable fix, so world is the PoC and exposure is non-zero. exploited before a fix=false under R4: the first fix (4 Jul 2026) was public before the earliest public evidence of exploitation (CISA KEV, 27 Aug 2026; ctipilot.ch: 'no public exploitation narrative ... has been located'); a public PoC is not evidence of in-the-wild exploitation. (Was null before the 23 Oct 2026 correction pass.) Red Hat bulletin RHSB-2026-009 ('Public Date: July 1, 2026') covers RHEL.

CVSS 7.8 from the kernel CNA record. Audit-2 T2 re-check (23 Oct 2026): no later report places exploitation before the 4 Jul 2026 fix, so false stands.

The University of Wisconsin advisory of early July says 'There are no reports of it being exploited in the wild.'; Red Hat RHSB-2026-009, the Fedora CoreOS tracker, ctipilot.ch, Security Arsenal and AiCybr date exploitation only from CISA's KEV listing (27 Aug 2026).

One unverified wiki-style page (Baidu Baike) mentions a compromise on 14 Jul 2026, which is after the fix. Searched: web and news for post-mortems and IR reports, and the sources above.

Related

Linux kernel report card