CVE-2026-72250

Kernel memory exposure and crash via header wraparound

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-range pointer offset in the Linux kernel allows local users to expose kernel memory or crash the system via IPv6 fragments. nf_ct_frag6_reasm() removes the IPv6 fragment header, then adds eight to an unset u16 mac_header sentinel, wrapping it to 7 and making headroom appear to contain a valid link-layer header. The affected NF_INET_LOCAL_OUT path requires low-privileged local access; later use of the invalid pointer exposes memory or terminates the kernel.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-range pointer offset in the Linux kernel allows local users to expose kernel memory or crash the system via IPv6 fragments. nf_ct_frag6_reasm() removes the IPv6 fragment header, then adds eight to an unset u16 mac_header sentinel, wrapping it to 7 and making headroom appear to contain a valid link-layer header. The affected NF_INET_LOCAL_OUT path requires low-privileged local access; later use of the invalid pointer exposes memory or terminates the kernel.

The record

CVE
CVE-2026-72250
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-823, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.15
  2. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <00bdce2fda7e430d24cfbc96764a1b96deb31f82
  3. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <2a95ec21824a8ad81ad660b12231456fc0ac9830
  4. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9
  5. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <53ef70a315420ed31581d38343684b3bf9a3c76d
  6. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <6e8cd710ca35c576f5f2e5a396047c9ac61f75e5
  7. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <a58230f3a7c4f6c3261786bc1efb72c42e68cd25
  8. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <bbcdef2061b170af45702ce6b359c02c12acfc94
  9. Affected versionversion=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.15; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <00bdce2fda7e430d24cfbc96764a1b96deb31f82; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <2a95ec21824a8ad81ad660b12231456fc0ac9830; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <53ef70a315420ed31581d38343684b3bf9a3c76d; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <6e8cd710ca35c576f5f2e5a396047c9ac61f75e5; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <a58230f3a7c4f6c3261786bc1efb72c42e68cd25; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <bbcdef2061b170af45702ce6b359c02c12acfc94; version=9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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