{
  "cveId": "CVE-2026-74659",
  "url": "https://patchblox.com/security/cve/CVE-2026-74659",
  "summary": "CVE-2026-74659 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-74659, released August 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net: bridge: mrp: fix uninitialised bytes on the wire",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: bridge: mrp: fix uninitialised bytes on the wire  br_mrp_alloc_test_skb() builds MRP test frames on an skb from dev_alloc_skb(), which does not clear the linear data area.  On the MRA ring-role branch the sub-option TLV header is appended with  \tsub_tlv = skb_put(skb, sizeof(*sub_tlv)); \tsub_tlv-\u003Etype = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR;  so sub_tlv-\u003Elength is never written, and the two trailing alignment bytes are appended with a bare skb_put() that does not clear them either.  The neighbouring oui and sub_opt regions are explicitly zeroed, so three uninitialised bytes are left in every MRA MRP_Test frame that goes out.  Put the sub-option TLV header and the alignment padding in a single skb_put_zero(), which clears both.  The AUTO_MGR sub-TLV carries no payload, so the zeroed length field is already the value it should have.",
  "published": "2026-08-22T16:16:39Z",
  "severity": "Low",
  "cvss": 2.3,
  "epss": 0.00173,
  "epssPercentile": 0.067,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74659",
  "fixes": [
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  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}