CVE-2026-98568
- Source
- https://cve.org/CVERecord?id=CVE-2026-98568
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98568.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98568
- Downstream
- Published
- 2026-10-18T15:18:34Z
- Modified
- 2026-10-19T02:45:27Z
- Summary
- vxlan: use one headroom snapshot for neighbour replies
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98568.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14
- https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6
- https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc
- https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7
- https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98568.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98568
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4b29dba9c085a4fb79058fb1c45a2f6257ca3dfaFixed45a67662bf8ce3aa5643accf98d328dfbb47eaf6Fixed315d42ca39f69846662961c25dcf2bb07c350d14Fixeda3c5eb6e382dd426a5e7eb08608897ed57167ff7Fixedff022fd9d0f0282c575e11778b96bd1b637503ebFixed481506a756dcd828ef42391cb08f38d8d96d38fc
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3.12.18Fixed3.13
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3.13.10Fixed3.14
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd8be18c52dbc94989f6d74637b731af39cd3d902
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3927dace523706cc00f808520eaf2125dd7c07b5