net/openvswitch: check Ethernet header length in key_extract()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74701
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:44 UTC
Updated2026-08-25 06:18:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Ethernet header length in key_extract() When a packet arrives on an ARPHRD_NONE device (e.g. TUN), ovs_flow_key_extract() trusts the user-provided skb->protocol field: if it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in __skb_pull() when the linear area is too small. kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovs_flow_key_extract+0x419/0xa70 ovs_vport_receive+0x222/0x390 netdev_frame_hook+0x3e0/0x630 tun_get_user+0x2d0c/0x38e0 Fixed by calling check_header() in key_extract() before accessing the Ethernet header.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001300000 probability, percentile 0.028400000 (date 2026-08-25)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a e85278afd4890dd190ba3c7a1b1a712b801c9fe1 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a 831471718f6e19aed1a330b03b53190a90e06466 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a d8bea341b183190ce6c055ab0e64ab78eb9a7290 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a 0b60b55652ba772b173dddc63f3851e1d2dd5927 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a a8139285c8925efe59af28a9169bb2fda91bff15 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 git Not specified
CNA Linux Linux affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a cf6f8b29befb92173659bcef6a441d274947bfae git Not specified
CNA Linux Linux affected 4.10 Not specified
CNA Linux Linux unaffected 4.10 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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