CVE-2026-98568
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
vxlan: use one headroom snapshot for neighbour replies
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa | affected | git | 45a67662bf8ce3aa5643accf98d328dfbb47eaf6 | Unavailable | None listed |
| 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa | affected | git | 315d42ca39f69846662961c25dcf2bb07c350d14 | Unavailable | None listed |
| 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa | affected | git | a3c5eb6e382dd426a5e7eb08608897ed57167ff7 | Unavailable | None listed |
| 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa | affected | git | ff022fd9d0f0282c575e11778b96bd1b637503eb | Unavailable | None listed |
| 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa | affected | git | 481506a756dcd828ef42391cb08f38d8d96d38fc | Unavailable | None listed |
| d8be18c52dbc94989f6d74637b731af39cd3d902 | affected | git | Unavailable | Unavailable | None listed |
| 3927dace523706cc00f808520eaf2125dd7c07b5 | affected | git | Unavailable | Unavailable | None listed |
| 3.12.18 | affected | semver | 3.13 | Unavailable | None listed |
| 3.13.10 | affected | semver | 3.14 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.14 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.14 | Unavailable | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.112 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.55 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.9 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |