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CVE

CVE-2026-74475

vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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CVE

CVE-2026-74475

vxlan: use neigh_ha_snapshot() in route_shortcircuit()

In the Linux kernel, the following vulnerability has been resolved:

vxlan: use neighhasnapshot() in route_shortcircuit()

The neighbour hardware address n->ha can be updated asynchronously by the

neighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without

holding the seqlock loop can lead to torn reads or reading a partially updated

MAC address.

Use neighhasnapshot() in route_shortcircuit() to safely copy n->ha under

readseqbegin()/readseqretry() lock protection before using it.

Note that arpreduce() and neighreduce() seem to have the same issue

left for future patches.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/05f2987f73daa05333fd713d05546142f9f7c5f0, https://git.kernel.org/stable/c/32a9590a8d30426e3db63e6b20893e47e02576c0, https://git.kernel.org/stable/c/87210054bad82bbae6f483a742dc45722fb47a6b, https://git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d, https://git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0, https://git.kernel.org/stable/c/d0993fc053f29e15cc7c9fe2029df3882a2ab5ab, https://git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3, https://git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74475.json, https://nvd.nist.gov/vuln/detail/CVE-2026-74475, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

10

CVSS Score
0
10

Basic Information

Base CVSS
10
EPSS Probability
0.00454%
EPSS Percentile
0.3764%
Introduced Version
e4f67addf158f98f8197e08974966b18480dc751,3.8.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d,5.10.265,5.15.216,6.1.183,6.6.151,6.12.103,6.18.44,7.1.8,6.12.105-1

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