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.
CVE-2026-46300
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-46300
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "3599e6b3cc1ada96883d496a50a210d3afbb6987",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "9d3e5fd19fe1063bf607219e8562fbd567b8e8d5",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "78bf6b6bb19541d19fbda6242e7cfe2c682763c0",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "3bd9e113d50034db99d7ef69fd8e5242d15e414a",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "3884358a9286b17f389a72b1426fc4547c23c111",
"versionType": "git"
},
{
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"lessThan": "f84eca5817390257cef78013d0112481c503b4a3",
"versionType": "git"
}
],
"programFiles": [
"net/core/skbuff.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.257",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.208",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.174",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/skbuff.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46300
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40170 · Revision 1
- Added to Heist Feed
- Publisher date