net: gro: don't merge zcopy skbs
In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.
CVE-2026-46323
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-2026-46323
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": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d",
"versionType": "git"
},
{
"status": "affected",
"version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "1f9c828556416fbe3f49386708ce999fc4d4da06",
"versionType": "git"
},
{
"status": "affected",
"version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "479084ae0e1d9cb7929cb4298d35623de189f80a",
"versionType": "git"
},
{
"status": "affected",
"version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "e334cbf3388fd9334503a778a82d9e9f14dd2f71",
"versionType": "git"
},
{
"status": "affected",
"version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "44bea2032af0425e4ce6d26a8af0ede79db49ec1",
"versionType": "git"
},
{
"status": "affected",
"version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
"lessThan": "4db79a322db8c97f7b73b8a347395ef4d685eb40",
"versionType": "git"
}
],
"programFiles": [
"net/core/gro.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/gro.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46323
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40684 · Revision 1
- Added to Heist Feed
- Publisher date