🛡️ CVE-2026-46300 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net: skbuff: preserve shared-frag marker during coalescing

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-46300 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 7.0.10)
  • linux-kernel

Timeline and source

Published on 23 May 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

www.openwall.com (Web)
www.openwall.com (Web)
www.openwall.com (Web)
www.openwall.com (Web)
cert-portal.siemens.com (Web)
cert-portal.siemens.com (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
security.access.redhat.com (Web)

CVE-2026-46300 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-23
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.10
linux-kernel — —

References

Similar Threats

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