Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
217ac77a3c2524d999730b2a80b61fcc2d0f734a to < e85278afd4890dd190ba3c7a1b1a712b801c9fe1affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < 831471718f6e19aed1a330b03b53190a90e06466affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < d8bea341b183190ce6c055ab0e64ab78eb9a7290affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < 0b60b55652ba772b173dddc63f3851e1d2dd5927affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < a8139285c8925efe59af28a9169bb2fda91bff15affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699affected217ac77a3c2524d999730b2a80b61fcc2d0f734a to < cf6f8b29befb92173659bcef6a441d274947bfaeaffected
Linux Linux
Default version status: affected
4.10affected0 to < 4.10unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1 ↗
- https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 ↗
- https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466 ↗
- https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290 ↗
- https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927 ↗
- https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15 ↗
- https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 ↗
- https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae ↗