tap: free page on error paths in tap_get_user_xdp()
In the Linux kernel, the following vulnerability has been resolved: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk. Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().
CVE-2026-46320
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-2026-46320
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": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "8d03e65eb6cfbffec471a6b65416f93679bf3286",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "f979971835dddbca86cf99e3b2e2b94a408a1ab2",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "3f52a86a482a69294c50a5a2a097bd6f4104990a",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "d30aac0fa00ca0afc3e08174cf7f974a66bdcf05",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "d68eab61944a9b0826fa2e954e42db1aa3201b7a",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "e27c17346628cb56843a83f93ac63c314c00f388",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "18a84c35842e19cd3c5534d8cee73d31863f696d",
"versionType": "git"
},
{
"status": "affected",
"version": "0efac27791ee068075d80f07c55a229b1335ce12",
"lessThan": "3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/tap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/tap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46320
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40680 · Revision 1
- Added to Heist Feed
- Publisher date