CVE-2026-98568None▾ SunlitIn 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 headroo…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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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.
Linux >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa < 45a67662bf8ce3aa5643accf98d328dfbb47eaf6Linux >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa < 315d42ca39f69846662961c25dcf2bb07c350d14Linux >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa < a3c5eb6e382dd426a5e7eb08608897ed57167ff7Linux >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa < ff022fd9d0f0282c575e11778b96bd1b637503ebLinux >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa < 481506a756dcd828ef42391cb08f38d8d96d38fcLinux d8be18c52dbc94989f6d74637b731af39cd3d902Linux 3927dace523706cc00f808520eaf2125dd7c07b5Linux >= 3.12.18 < 3.13Linux >= 3.13.10 < 3.14Linux 3.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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