packet: use consistent hard_header_len in TX_RING send path
In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in TX_RING send path tpacket_snd() reads dev->hard_header_len independently for skb allocation and header construction in tpacket_fill_skb(). Concurrent netdevice reconfiguration can therefore make the reserved headroom smaller than the amount later pushed, or make copylen - hard_header_len negative. Snapshot hard_header_len once before processing ring frames and use it for the frame limit, headroom allocation, copy length, and skb construction. Pass the snapshot to tpacket_fill_skb(). The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.
CVE-2026-74668
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-2026-74668
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": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "9c7e8ff48c377bef18c3d178748aea0575b69ede",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "2a73b2c37ee3060a880b53cd24783d93fc7be5f8",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "d85d2fd54e901637c81d847811e03c662aee13cd",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "016763e829cac37b3234eace86fd0a4c560de4a7",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "27e068d1b35dbec10a3cf268887c94407be4badc",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "d48ea5c9c4c34dc0df621f0e39ed3a16b644621a",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "21b5953e7494c16a42e6cd8cf110e18d13ae4a6b",
"versionType": "git"
}
],
"programFiles": [
"net/packet/af_packet.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.31"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/packet/af_packet.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74668
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34266 · Revision 1
- Added to Heist Feed
- Publisher date