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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: This week (action score 61/100)

  • CISA has confirmed exploitation in the wild (Aug 27, 2026). Remediation deadline for US federal agencies: Aug 30, 2026.
  • Probability of exploitation in the next 30 days: 0.70% (FIRST EPSS); higher than 53.6% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 14200d435af9a9eeb444f529fc2f689a236b7962, 46f201f8b4c39633a1fa3dc12459f506d470993d, 6374fb9edf72c67a118a2c214a0dddd04c921e0a; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1.

Don’t wait for the next maintenance window. Upgrade to Linux Linux 14200d435af9a9eeb444f529fc2f689a236b7962, 46f201f8b4c39633a1fa3dc12459f506d470993d, 6374fb9edf72c67a118a2c214a0dddd04c921e0a; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info. An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES. The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.

HighCVSS 7.8 · v3.1KEVWeaponized Fix available
Published
Jul 4, 2026
Updated
Oct 15, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

61

This week

Don’t wait for the next maintenance window.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 27, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Aug 30, 2026.

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  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
siemenssimatic s7-1500 tm mfp firmware
siemenssimatic s7-1500 tm mfp

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.0 and later · before 6.1.177
  • linux linux kernel6.2 and later · before 6.6.144
  • linux linux kernel6.7 and later · before 6.12.95
  • linux linux kernel6.13 and later · before 6.18.38
  • linux linux kernel6.19 and later · before 7.1.3
  • siemens simatic s7-1500 tm mfp firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.0affected
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before 14200d435af9a9eeb444f529fc2f689a236b7962affected · git
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before 65fb14cbebb0cd0eff903a22d33537ddc8b95769affected · git
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before 46f201f8b4c39633a1fa3dc12459f506d470993daffected · git
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before 6374fb9edf72c67a118a2c214a0dddd04c921e0aaffected · git
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before e9eacf19281ea2498b36291b56c9606118c2d74eaffected · git
    • 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 and later · before 736b380e28d0480c7bc3e022f1950f31fe53a7c5affected · git
    • before 6.0not affected · semver
    • 6.1.177 and later · up to and including 6.1.*not affected · semver
    • 6.6.144 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.177-16.1.177-1
Debian:13linuxbefore 6.12.95-16.12.95-1
Debian:14linuxbefore 7.1.3-17.1.3-1
openSUSE:Tumbleweedkernel-sourcebefore 7.1.3-1.17.1.3-1.1
Red Hat:enterprise_linux:10.2kernelbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64kbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-corebefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debugbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-corebefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-debuginfobefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-develbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-devel-matchedbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modulesbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modules-corebefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modules-extrabefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debuginfobefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-develbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-devel-matchedbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modulesbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modules-corebefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modules-extrabefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-abi-stablelistsbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-corebefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2
Red Hat:enterprise_linux:10.2kernel-debugbefore 0:6.12.0-211.30.1.el10_20:6.12.0-211.30.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53360Jul 4, 2026 · KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use
    35Monitor
  • ← EarlierCVE-2026-53361Jul 4, 2026 · af_unix: Set gc_in_progress to true in unix_gc().
    28Monitor
  • Later →CVE-2026-53363Jul 10, 2026 · xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux14200d435af9a9eeb444f529fc2f689a236b7962Vendor (CNA)
Linux Linux46f201f8b4c39633a1fa3dc12459f506d470993dVendor (CNA)
Linux Linux6374fb9edf72c67a118a2c214a0dddd04c921e0aVendor (CNA)
Linux Linux65fb14cbebb0cd0eff903a22d33537ddc8b95769Vendor (CNA)
Linux Linux736b380e28d0480c7bc3e022f1950f31fe53a7c5Vendor (CNA)
Linux Linuxe9eacf19281ea2498b36291b56c9606118c2d74eVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.144.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.177-1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.1.3-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_233-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_242-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_242-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_104-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_114-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_122-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_132-160000.1.2 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_142-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-livepatch-SLE16_Update_76-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)

+3

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-07-03

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-2 d
  2. Published
  3. CISA KEV+53 d
  4. TodayNov 6, 2026+125 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records