CVE-2026-98568vxlan: use one headroom snapshot for neighbour replies
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: vxlan: use one headroom snapshot for neighbour replies vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then samples it again to reserve headroom. A concurrent vxlan_changelink() can update needed_headroom between the two reads, creating a TOCTOU race. The second value can exceed the allocation and make the Ethernet header write out of bounds. The race is reproducible on the unpatched kernel. It occurred when vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte skbuff_small_head allocation. Snapshot the headroom once and use that value for both allocation and reservation.
- CVSS
- Not yet scored
- 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
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 45a67662bf8ce3aa5643accf98d328dfbb47eaf6; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 315d42ca39f69846662961c25dcf2bb07c350d14; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before a3c5eb6e382dd426a5e7eb08608897ed57167ff7; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before ff022fd9d0f0282c575e11778b96bd1b637503eb; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 481506a756dcd828ef42391cb08f38d8d96d38fc; d8be18c52dbc94989f6d74637b731af39cd3d902; 3927dace523706cc00f808520eaf2125dd7c07b5; from 3.12.18 before 3.13; and 1 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6
- https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14
- https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7
- https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb
- https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc
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.