net: mctp: unshare packets when reassembling
In the Linux kernel, the following vulnerability has been resolved: net: mctp: unshare packets when reassembling Ensure that the frag_list used for reassembly isn't shared with other packets. This avoids incorrect reassembly when packets are cloned, and prevents a memory leak due to circular references between fragments and their skb_shared_info. The upcoming MCTP-over-USB driver uses skb_clone which can trigger the problem - other MCTP drivers don't share SKBs. A kunit test is added to reproduce the issue.
CVE-2025-21972
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-2025-21972
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": "4a992bbd365094730a31bae1e12a6ca695336d57",
"lessThan": "3d0281d0713952e8dd14d6d47e3a9c345c28a3b7",
"versionType": "git"
},
{
"status": "affected",
"version": "4a992bbd365094730a31bae1e12a6ca695336d57",
"lessThan": "5c47d5bfa7b096cf8890afac32141c578583f8e0",
"versionType": "git"
},
{
"status": "affected",
"version": "4a992bbd365094730a31bae1e12a6ca695336d57",
"lessThan": "f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e",
"versionType": "git"
},
{
"status": "affected",
"version": "4a992bbd365094730a31bae1e12a6ca695336d57",
"lessThan": "f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc",
"versionType": "git"
}
],
"programFiles": [
"net/mctp/route.c",
"net/mctp/test/route-test.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.20",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.8",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mctp/route.c",
"net/mctp/test/route-test.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21972
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #45956 · Revision 1
- Added to Heist Feed
- Publisher date