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CVE-2026-98568

UnknownEPSS 0.20%

Last modified

CVE-2026-98568 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < e3e24f4c434c56952412f875b834aa9daaa4fb15; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < 9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < fcaf456092dc86fd5b0b523ac27ec0d114066931; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < 45a67662bf8ce3aa5643accf98d328dfbb47eaf6; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < 315d42ca39f69846662961c25dcf2bb07c350d14; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < a3c5eb6e382dd426a5e7eb08608897ed57167ff7; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < ff022fd9d0f0282c575e11778b96bd1b637503eb; >= 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, < 481506a756dcd828ef42391cb08f38d8d96d38fc; d8be18c52dbc94989f6d74637b731af39cd3d902; 3927dace523706cc00f808520eaf2125dd7c07b5; >= 3.12.18, < 3.13; >= 3.13.10, < 3.14
LinuxLinux3.14

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98568?
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.
How severe is CVE-2026-98568?
Severity scoring for CVE-2026-98568 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98568?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST