CVE-2026-46300

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Source
https://cve.org/CVERecord?id=CVE-2026-46300
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46300.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-46300
Downstream
Related
Published
2026-05-23T11:44:02.231Z
Modified
2026-06-18T03:54:41.916063137Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
net: skbuff: preserve shared-frag marker during coalescing
Details

In the Linux kernel, the following vulnerability has been resolved:

net: skbuff: preserve shared-frag marker during coalescing

skbtrycoalesce() can attach paged frags from @from to @to. If @from has SKBFLSHAREDFRAG 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 skbhassharedfrag() before deciding whether an uncloned nonlinear skb can skip skbcowdata(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skbhassharedfrag() as false and decrypt in place over page-cache backed frags.

Propagate SKBFLSHAREDFRAG when skbtrycoalesce() 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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46300.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
cef401de7be8c4e155c6746bfccf721a4fa5fab9
Fixed
3599e6b3cc1ada96883d496a50a210d3afbb6987
Fixed
2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c
Fixed
9d3e5fd19fe1063bf607219e8562fbd567b8e8d5
Fixed
78bf6b6bb19541d19fbda6242e7cfe2c682763c0
Fixed
760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e
Fixed
3bd9e113d50034db99d7ef69fd8e5242d15e414a
Fixed
3884358a9286b17f389a72b1426fc4547c23c111
Fixed
f84eca5817390257cef78013d0112481c503b4a3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46300.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.9.0
Fixed
5.10.257
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.208
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.174
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.141
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.91
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.33
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.0.10

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46300.json"