ip6_gre: fix hardware header length for NBMA tunnels
In the Linux kernel, the following vulnerability has been resolved: ip6_gre: fix hardware header length for NBMA tunnels ip6gre_tnl_link_config_route() accumulates the lower device's hardware header length into dev->hard_header_len whenever header_ops is set. This is incorrect for both users of header_ops. ip6gretap and ip6erspan have a fixed Ethernet hardware header length. For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header, the optional FOU or GUE header, and the outer IPv6 header. The lower device header is headroom needed later, not part of the tunnel device's hardware header. Keep the lower device header in needed_headroom. Set hard_header_len to the tunnel header length only for ARPHRD_IP6GRE devices with header_ops, and leave the fixed Ethernet header length unchanged for tap and erspan devices.
CVE-2026-89562
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-2026-89562
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": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "cb1afd087aedc90e5274537e4fb9bf3f98e5afdb",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "b1e95e3602d8e112458627f14c6c31c21f2188cb",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "c3457a5aae5fb43f7023d3f3dc472c2afa22acf0",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "8bfe746afee38dd6e4348ddcd22d554789dbb9ff",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "b8282668d8fa7c61b80e8e4890729031c291a16c",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "565038b0092f65afe384961c0f548d605bf438b9",
"versionType": "git"
},
{
"status": "affected",
"version": "832ba596494b2c9eac7760259eff2d8b7dcad0ee",
"lessThan": "505b6d296c486ef7d1274f279d4c43a172f63224",
"versionType": "git"
},
{
"status": "affected",
"version": "cf3d9717a5271573fa193c4dfa0df856295d5b15",
"versionType": "git"
},
{
"status": "affected",
"version": "187a6daf5db45adc807c85bbe285319107bed198",
"versionType": "git"
},
{
"status": "affected",
"version": "d9897bb66ce989325b4bf4cdbb6a799e4ac878b6",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.162",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.82",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.9.13",
"lessThan": "5.10",
"versionType": "semver"
}
],
"programFiles": [
"net/ipv6/ip6_gre.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ip6_gre.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89562
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35076 · Revision 1
- Added to Heist Feed
- Publisher date