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CVE-2026-43500· NVD / CVE Program· CNA Linux

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

HighCVSS 7.8 · v3.1—Weaponized Fix available
Published
May 11, 2026
Updated
Sep 1, 2026
EPSS
2.3% · 82th percentile▼ 91
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Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

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

Affected systems

VendorProduct
linuxlinux kernel

Affected versions

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

  • linux linux kernelafter 5.3 · before 6.18.29
  • linux linux kernel6.19 and later · before 7.0.6
  • linux linux kernel5.3
  • linux linux kernel7.1

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

    • 5.3affected
    • d0d5c0cd1e711c98703f3544c1e6fc1372898de5 and later · before 7c504ffab3efce8f7e4f463b314ae31030bdf18baffected · git
    • d0d5c0cd1e711c98703f3544c1e6fc1372898de5 and later · before 3711382a77342a9a1c3d2e7330dcfc7ea927f568affected · git
    • d0d5c0cd1e711c98703f3544c1e6fc1372898de5 and later · before 3eae0f4f9f7206a4801efa5e0235c25bbd5a412caffected · git
    • d0d5c0cd1e711c98703f3544c1e6fc1372898de5 and later · before d45179f8795222ce858770dc619abe51f9d24411affected · git
    • d0d5c0cd1e711c98703f3544c1e6fc1372898de5 and later · before aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71affected · git
    • before 5.3not affected · semver
    • 6.6.140 and later · up to and including 6.6.*not affected · semver
    • 6.12.88 and later · up to and including 6.12.*not affected · semver
    • 6.18.29 and later · up to and including 6.18.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.40.1.el10_26.12.0-211.40.1.el10_2

+56

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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 Linux3711382a77342a9a1c3d2e7330dcfc7ea927f568Vendor (CNA)
Linux Linux3eae0f4f9f7206a4801efa5e0235c25bbd5a412cVendor (CNA)
Linux Linux7c504ffab3efce8f7e4f463b314ae31030bdf18bVendor (CNA)
Linux Linuxaa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71Vendor (CNA)
Linux Linuxd45179f8795222ce858770dc619abe51f9d24411Vendor (CNA)
almalinux:kernel6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.40.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.170-3 · Debian:12Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.30.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-syms6.12.0-160000.30.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)

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

  • Metasploit module ×1
  • Exploit-DB entry ×2
  • Proof-of-concept repository on GitHub ×2

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
Exploit-DB entrylocal2026-05-29
Exploit-DB entrylocal2026-05-27
Metasploit moduleexploit/linux/local/cve_2026_43500_dirty_fragrxkad Page-Cache Write via CVE-2026-43500exploit2026-05-08
Proof-of-concept repository on GitHubstars:02026-04-30
Proof-of-concept repository on GitHubstars:02026-05-09

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-11 d
  2. Metasploit-3 d
  3. Published
  4. TodaySep 30, 2026+143 d
EPSS, last 120 days-91% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

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-primary

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.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

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

References

All records