Out-of-bounds Write Affecting linux-6.1 package, versions <6.1.174-1~deb11u1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

Exploit Maturity
Attacked
EPSS
15.72% (97th percentile)

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  • Snyk IDSNYK-DEBIAN11-LINUX61-17099557
  • published30 May 2026
  • disclosed23 May 2026

Introduced: 23 May 2026

CVE-2026-46300  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Debian:11 linux-6.1 to version 6.1.174-1~deb11u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-6.1 package and not the linux-6.1 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

References

CVSS Base Scores

version 3.1