CVE-2026-89562ip6_gre: fix hardware header length for NBMA tunnels
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before cb1afd087aedc90e5274537e4fb9bf3f98e5afdb; from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before 7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a; from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before b1e95e3602d8e112458627f14c6c31c21f2188cb; from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before c3457a5aae5fb43f7023d3f3dc472c2afa22acf0; 832ba596494b2c9eac7760259eff2d8b7dcad0ee builds before 8bfe746afee38dd6e4348ddcd22d554789dbb9ff; from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before b8282668d8fa7c61b80e8e4890729031c291a16c; from 832ba596494b2c9eac7760259eff2d8b7dcad0ee before 565038b0092f65afe384961c0f548d605bf438b9; 832ba596494b2c9eac7760259eff2d8b7dcad0ee builds before 505b6d296c486ef7d1274f279d4c43a172f63224; and 6 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb
- https://git.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a
- https://git.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cb
- https://git.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0
- https://git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff
- https://git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c
- https://git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9
- https://git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.