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CVE-2026-74701

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In 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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in e85278afd4890dd190ba3c7a1b1a712b801c9fe1; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in 831471718f6e19aed1a330b03b53190a90e06466; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in d8bea341b183190ce6c055ab0e64ab78eb9a7290; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in 0b60b55652ba772b173dddc63f3851e1d2dd5927; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in a8139285c8925efe59af28a9169bb2fda91bff15; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699; From 217ac77a3c2524d999730b2a80b61fcc2d0f734a · fixed in cf6f8b29befb92173659bcef6a441d274947bfae

  • Linux Linux

    4.10

  • KernelLinux

    From 4.10.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.152; From 6.7.0 · fixed in 6.12.104; From 6.13.0 · fixed in 6.18.45; From 6.19.0 · fixed in 7.1.9

References 8

git.kernel.org