{
  "cveId": "CVE-2026-98377",
  "url": "https://patchblox.com/security/cve/CVE-2026-98377",
  "summary": "CVE-2026-98377 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-98377, released October 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "vlan: require the MAC header to be present in __vlan_insert_inner_tag()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  vlan: require the MAC header to be present in __vlan_insert_inner_tag()  __vlan_insert_inner_tag() only guarantees head room via skb_cow_head(), never that mac_len bytes of MAC header are present.  Its ETH_HLEN wrappers - __vlan_insert_tag() under skb_vlan_push(), and vlan_insert_tag() under validate_xmit_vlan() on the generic transmit path - therefore rewrite the first 16 bytes at skb-\u003Edata: a 12-byte memmove plus two 2-byte stores at \u002B12 and \u002B14.  No caller supplies the bound, while the pop helpers use skb_ensure_writable()/pskb_may_pull().  An IFF_TUN device has hard_header_len == 0, so packet_snd() accepts a one-byte AF_PACKET/SOCK_RAW frame.  The first vlan push only sets a hwaccel tag; the next - clsact \u0022action vlan push\u0022 or bpf_skb_vlan_push() - enters the helper with skb-\u003Elen still 1.  The head comes from skbuff_small_head without __GFP_ZERO, so each push drags bytes from beyond skb-\u003Etail into the frame.  After three the one-byte send leaves as 13 bytes carrying 11 bytes of uninitialised slab:    0000: 5a b3 62 12 80 88 ff ff 00 b3 62 12 81            \u0060------------------------------\u0027   only 0x5a was sent; the rest is slab, here the top 56 bits of a   linear-map address  Require the MAC header the helper rewrites to be present, so such a frame is dropped rather than transmitted.",
  "published": "2026-10-09T08:16:56Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00171,
  "epssPercentile": 0.06492,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98377",
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