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Public proof of conceptFix available

CVE-2026-43500

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

A public proof of concept exists; no exploitation attested.

  • Published2026-05-11
  • Fixed in7.0.6 · 6.18.29
  • WeaknessCWE-123 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-05-1108:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-43500?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-43500?format=csv
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Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
7.0≥ 6.19, < 7.0.67.0.6
6.18> 5.3, < 6.18.296.18.29
5.3= 5.3no fix published
7.1= 7.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kernelAlmaLinux:10all versions · fixed in 6.12.0-211.40.1.el10_2and 74 other packages

Vendor advisories

  • CVE-2026-43500 Red Hat Product Security

    kernel: "Dirty Frag" RxRPC variant is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel

  • ICSA-26-225-04 CISA1 known affected

    Hitachi Energy APM Edge Product

    APM Edge versions 6.10 and prior

Full record on NVD

Fix

  1. Update Linux linux kernel to 7.0.6 · 6.18.29
  2. Mitigation from the vendor CISA ICSA-26-225-04 · 1 productDisable the rxrpc module [2]

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52585EDB-52591
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedattaattaatta/CVE-2026-43500vorkampfer/dirty_frag_mitigation
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-05-11
Last Modified
2026-08-24
NVD status
Modified
MSRC Title
rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

Frequently asked questions

What is CVE-2026-43500?

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.

Is CVE-2026-43500 actively exploited?

Active exploitation of CVE-2026-43500 has not been confirmed. Its EPSS score was 2.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-43500?

CVE-2026-43500 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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