neigh: let neigh_xmit take skb ownership
In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.
CVE-2026-52981
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-2026-52981
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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "8a89054a1ec0767aec25ed2bbac933da6ba3cf5a",
"versionType": "git"
},
{
"status": "affected",
"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "9247d59ca15bf60a57dca08103f055d8a4340877",
"versionType": "git"
},
{
"status": "affected",
"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "0084712e0bee204b284510cdb63182fd5a30c2b7",
"versionType": "git"
},
{
"status": "affected",
"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "63063ba60d2dc334e34f1e3f9271d7f3f6f30307",
"versionType": "git"
},
{
"status": "affected",
"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "445e45a2c3a078316a62d2d331a570cf34ef5079",
"versionType": "git"
},
{
"status": "affected",
"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
"lessThan": "4438113be604ee67a7bf4f81da6e1cca41332ce4",
"versionType": "git"
}
],
"programFiles": [
"net/core/neighbour.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.175",
"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/neighbour.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52981
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40723 · Revision 1
- Added to Heist Feed
- Publisher date