{
  "cveId": "CVE-2025-21921",
  "url": "https://patchblox.com/security/cve/CVE-2025-21921",
  "summary": "CVE-2025-21921 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21921, released April 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: ethtool: netlink: Allow NULL nlattrs when g...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device  ethnl_req_get_phydev() is used to lookup a phy_device, in the case an ethtool netlink command targets a specific phydev within a netdev\u0027s topology.  It takes as a parameter a const struct nlattr *header that\u0027s used for error handling :         if (!phydev) {                NL_SET_ERR_MSG_ATTR(extack, header,                                    \u0022no phy matching phyindex\u0022);                return ERR_PTR(-ENODEV);        }  In the notify path after a -\u003Eset operation however, there\u0027s no request attributes available.  The typical callsite for the above function looks like:  \tphydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_XXX_HEADER], \t\t\t\t      info-\u003Eextack);  So, when tb is NULL (such as in the ethnl notify path), we have a nice crash.  It turns out that there\u0027s only the PLCA command that is in that case, as the other phydev-specific commands don\u0027t have a notification.  This commit fixes the crash by passing the cmd index and the nlattr array separately, allowing NULL-checking it directly inside the helper.",
  "published": "2025-04-01T16:15:22Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00209,
  "epssPercentile": 0.11161,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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