AZL-97167
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-97167.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-97167
- Upstream
- Published
- 2026-08-22T16:16:44Z
- Modified
- 2026-08-31T05:26:27Z
- Summary
- CVE-2026-74701 affecting package kernel 6.6.150.1-1
- Details
-
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 ARPHRDNONE device (e.g. TUN), ovsflowkeyextract() trusts the user-provided skb->protocol field: if it is ETHPTEB, the packet is classified as MACPROTOETHERNET and keyextract() is called without ensuring the skb has ETHHLEN (14) bytes of linear data. keyextract() unconditionally pulls 2 * ETHALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in _skbpull() when the linear area is too small.
kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:keyextract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovsflowkeyextract+0x419/0xa70 ovsvportreceive+0x222/0x390 netdevframehook+0x3e0/0x630 tungetuser+0x2d0c/0x38e0
Fixed by calling checkheader() in keyextract() before accessing the Ethernet header.
- References