tun: free page on short-frame rejection in tun_xdp_one()
In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.
CVE-2026-46321
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-2026-46321
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": "6100e0237204890269e3f934acfc50d35fd6f319",
"lessThan": "0a6f46a9332ad6958992d64d3b3a81a80b2ca940",
"versionType": "git"
},
{
"status": "affected",
"version": "589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2",
"lessThan": "0e8211fcf9426f5adddf32516ba0f400ceb9544d",
"versionType": "git"
},
{
"status": "affected",
"version": "ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146",
"lessThan": "e915445942af6dcea628bf66d6241641201a0c41",
"versionType": "git"
},
{
"status": "affected",
"version": "d5ad89b7d01ed4e66fd04734fc63d6e78536692a",
"lessThan": "5b34f9e4fe2f203724a6e893d6df0316b9670057",
"versionType": "git"
},
{
"status": "affected",
"version": "049584807f1d797fc3078b68035450a9769eb5c3",
"lessThan": "69863ff2720a0e9871f1a5710f2a33a94217fee0",
"versionType": "git"
},
{
"status": "affected",
"version": "049584807f1d797fc3078b68035450a9769eb5c3",
"lessThan": "37a1c268c2c8090bf4dc552d732bd23ba36f8eb0",
"versionType": "git"
},
{
"status": "affected",
"version": "049584807f1d797fc3078b68035450a9769eb5c3",
"lessThan": "98c67be9eb9de72465a071949e84a3cdb8fab5a3",
"versionType": "git"
},
{
"status": "affected",
"version": "049584807f1d797fc3078b68035450a9769eb5c3",
"lessThan": "f4feb1e20058e407cb00f45aff47f5b7e19a6bbf",
"versionType": "git"
},
{
"status": "affected",
"version": "32b0aaba5dbc85816898167d9b5d45a22eae82e9",
"versionType": "git"
},
{
"status": "affected",
"version": "a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb",
"versionType": "git"
},
{
"status": "affected",
"version": "8418f55302fa1d2eeb73e16e345167e545c598a5",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.223",
"lessThan": "5.10.259",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.164",
"lessThan": "5.15.210",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.102",
"lessThan": "6.1.176",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.43",
"lessThan": "6.6.143",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.281",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.9.12",
"lessThan": "6.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.10.2",
"lessThan": "6.11",
"versionType": "semver"
}
],
"programFiles": [
"drivers/net/tun.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"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": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"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/tun.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46321
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28416 · Revision 1
- Added to Heist Feed
- Publisher date