CVE-2026-43500

Aliases:UBUNTU-CVE-2026-43500DEBIAN-CVE-2026-43500CGA-2c57-3vv9-j8cxCGA-6wmp-gwrq-mc5jCGA-7xvm-fhh7-mfqpCGA-9x88-fx28-c884CGA-c4vf-g79r-945mCGA-cpfp-fcmw-ccc8CGA-h7p9-3crh-282xCGA-jjvf-3hjm-r7xhCGA-mfvm-pm3f-73x7CGA-pm52-f567-cgmgCGA-w2hf-792v-f7r6CGA-wf6c-963r-7wwjCGA-xc8f-5r5w-pjv6
Advisory lineage Upstream: 0 Downstream: 23
Modified
Published: 11 May 2026, 06:26
Last modified:01 Sept 2026, 12:05

Vulnerability Summary

Overall Risk (default)
high
60/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
92.86% CRITICAL
93% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
4 found
Dark Web
Not detected

Timeline

11 May 2026, 06:26
Published
Vulnerability first disclosed
01 Sept 2026, 12:05
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 92.86%• Percentile: 100%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

  • CWE-123•Write-what-where Condition

    Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.

Affected Systems

  • chainguard•linux-aws-6.12

    all

  • chainguard•linux-aws-6.18

    < 6.18.31-r0

  • chainguard•linux-azure-6.12

    all

  • chainguard•linux-azure-6.18

    < 6.18.31-r0

  • chainguard•linux-gcp-6.12

    all

  • chainguard•linux-gcp-6.18

    < 6.18.31-r0

  • chainguard•linux-qemu-6.12

    all

  • chainguard•linux-qemu-6.18

    < 6.18.31-r0

  • chainguard•linux-qemu-6.18-bootc-boot-installed

    < 6.18.31-r0

  • chainguard•linux-qemu-melange

    < 6.18.31-r0

  • chainguard•linux-qemu-rc

    < 7.1_rc3-r0

  • chainguard•linux-vmware-6.12

    all

  • chainguard•linux-vmware-6.18

    < 6.18.31-r0

  • debian•linux

    < 5.10.251-4 | < 6.1.170-3 | < 6.12.86-1 | < 7.0.4-1

  • debian•linux-6.1

    < 6.1.170-3~deb11u1

  • ubuntu•linux

    < 5.4.0-231.251 | < 5.15.0-181.191 | < 6.8.0-124.124 | < 6.17.0-35.35 | < 7.0.0-22.22

  • ubuntu•linux-allwinner-5.19

    all

  • ubuntu•linux-aws

    < 5.4.0-1160.170 | < 5.15.0-1109.116 | < 6.8.0-1057.60 | < 6.17.0-1017.17 | < 7.0.0-1006.6

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.13

    all

  • ubuntu•linux-aws-5.15

    < 5.15.0-1109.116~20.04.1

  • ubuntu•linux-aws-5.19

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1160.170~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-6.14

    all

  • ubuntu•linux-aws-6.17

    < 6.17.0-1017.17~24.04.1

  • ubuntu•linux-aws-6.2

    all

  • ubuntu•linux-aws-6.5

    all

  • ubuntu•linux-aws-6.8

    < 6.8.0-1057.60~22.04.1

  • ubuntu•linux-aws-fips

    < 5.4.0-1160.170+fips1 | all | < 5.15.0-1109.116+fips1 | < 6.8.0-1057.60+fips1

  • ubuntu•linux-azure

    all | < 5.4.0-1164.170 | < 5.15.0-1114.123 | < 6.8.0-1058.64 | < 6.17.0-1017.17 | < 7.0.0-1007.7

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.13

    all

  • ubuntu•linux-azure-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-5.19

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1164.170~18.04.1

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-6.11

    all

  • ubuntu•linux-azure-6.14

    all

  • ubuntu•linux-azure-6.17

    < 6.17.0-1017.17~24.04.1

  • ubuntu•linux-azure-6.2

    all

  • ubuntu•linux-azure-6.5

    all

  • ubuntu•linux-azure-6.8

    < 6.8.0-1059.65~22.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all | all | all | all | all

  • ubuntu•linux-azure-fde-5.19

    all

  • ubuntu•linux-azure-fde-6.14

    all

Showing first 50 affected entries in server-rendered view.

References (40)