CVE-2026-98570: Linux kernel · net: ipv6: keep room for the mac header in dst_dev_overhead()
Source GCVE Database
Not known to be exploited · fixed in 87cd6b717e4069dca34e0866e57eaeb44d3b173e : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 87cd6b717e4069dca34e0866e57eaeb44d3b173e, 36c07127924f11fc5741a780abcaaf808fe9ef13, 6.14 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented in the Linux kernel to address this vulnerability by adjusting dst_dev_overhead() to return the larger required MAC header size, preventing the out-of-bounds write. Users should apply the official kernel update containing this fix. Since this is a kernel-level issue, updating to the patched kernel version is the recommended remediation. Patch status is not explicitly confirmed in the provided data; users should consult the vendor or kernel maintainers for the specific fixed versions and apply updates accordingly.
Description
A vulnerability in the Linux kernel's IPv6 networking code related to handling MAC header space in dst_dev_overhead() has been resolved. The issue occurs when the MAC header length exceeds the reserved space, such as with VLAN devices with reorder_hdr off, causing a negative offset and out-of-bounds memory write during skb_mac_header_rebuild(). This affects seg6, ioam6, and rpl lightweight tunnels. The fix ensures the function returns the larger of the two header size values to prevent memory corruption.