CVE-2026-46300

Aliases:UBUNTU-CVE-2026-46300DEBIAN-CVE-2026-46300RHBA-2026:20032CGA-3qmv-jf96-2vgjCGA-5rqf-qjmw-8wmrCGA-5vj3-pwxg-3j2hCGA-62wq-vwcm-83jfCGA-9722-p89m-4c89CGA-9x36-3f34-hqc5CGA-gff4-v2c3-mrwvCGA-mqv3-p83c-7fw8CGA-p4gf-wf2v-cqjwCGA-p86f-w7m8-jh2gCGA-rgx7-mcmf-55h2CGA-vr25-6qp7-2c38
Advisory lineage Upstream: 0 Downstream: 63
Modified
Published: 23 May 2026, 11:44
Last modified:08 Sept 2026, 08:49

Vulnerability Summary

Overall Risk (default)
medium
43/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
9.33% LOW
9% probability +2.33%
KEV
Not listed
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

23 May 2026, 11:44
Published
Vulnerability first disclosed
08 Sept 2026, 08:49
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

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: 9.33%• Percentile: 95%

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

    < 6.12.92-r0

  • chainguard•linux-aws-6.18

    < 6.18.34-r0

  • chainguard•linux-azure-6.12

    < 6.12.92-r0

  • chainguard•linux-azure-6.18

    < 6.18.34-r0

  • chainguard•linux-gcp-6.12

    < 6.12.92-r0

  • chainguard•linux-gcp-6.18

    < 6.18.34-r0

  • chainguard•linux-qemu-6.12

    < 6.12.92-r0

  • chainguard•linux-qemu-6.18

    < 6.18.34-r0

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

    < 6.18.34-r0

  • chainguard•linux-qemu-melange

    < 6.18.34-r0

  • chainguard•linux-vmware-6.12

    < 6.12.92-r0

  • chainguard•linux-vmware-6.18

    < 6.18.34-r0

  • debian•linux

    < 5.10.257-1 | < 6.1.174-1 | < 6.12.90-1 | < 7.0.9-1

  • debian•linux-6.1

    < 6.1.174-1~deb11u1

  • ubuntu•linux

    < 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

    < 5.15.0-1109.116 | < 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-5.8

    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

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

  • ubuntu•linux-azure

    all | < 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-5.8

    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

  • ubuntu•linux-azure-fde-6.2

    all

  • ubuntu•linux-azure-fde-6.8

    all

  • ubuntu•linux-azure-fde-7.0

    all

Showing first 50 affected entries in server-rendered view.

References (86)