CVE-2026-74475

In the Linux kernel, the following vulnerability has been resolved: vxlan: use neigh_ha_snapshot() 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 neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under read_seqbegin()/read_seqretry() lock protection before using it. Note that arp_reduce() and neigh_reduce() seem to have the same issue left for future patches.

CVSS v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 13:17

Updated : 2026-08-19 17:21

NVD link : CVE-2026-74475

Mitre link : CVE-2026-74475

CVE.ORG link : CVE-2026-74475

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-74475", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "32a9590a8d30426e3db63e6b20893e47e02576c0", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "d0993fc053f29e15cc7c9fe2029df3882a2ab5ab", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "87210054bad82bbae6f483a742dc45722fb47a6b", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "ec341bb76d77b4c2948764375ee6bfeef4bb41c3", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "ff89415d34c3ab9f5312316423122e664ed3524f", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "05f2987f73daa05333fd713d05546142f9f7c5f0", "versionType": "git"}, {"status": "affected", "version": "e4f67addf158f98f8197e08974966b18480dc751", "lessThan": "8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d", "versionType": "git"}], "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"status": "unaffected", "version": "0", "lessThan": "3.8", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "defaultStatus": "affected"}]}], "published": "2026-08-15T13:17:52.293", "references": [{"url": "https://git.kernel.org/stable/c/05f2987f73daa05333fd713d05546142f9f7c5f0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/32a9590a8d30426e3db63e6b20893e47e02576c0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/87210054bad82bbae6f483a742dc45722fb47a6b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d0993fc053f29e15cc7c9fe2029df3882a2ab5ab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use neigh_ha_snapshot() in route_shortcircuit()\n\nThe neighbour hardware address n->ha can be updated asynchronously by the\nneighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without\nholding the seqlock loop can lead to torn reads or reading a partially updated\nMAC address.\n\nUse neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under\nread_seqbegin()/read_seqretry() lock protection before using it.\n\nNote that arp_reduce() and neigh_reduce() seem to have the same issue\nleft for future patches."}], "lastModified": "2026-08-19T17:21:04.787", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}