CNVD-2026-21361

Vulnerability from cnvd - Published: 2026-05-22
VLAI
Title
Linux Kernel Fragnesia权限提升漏洞
Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel Fragnesia存在权限提升漏洞，该漏洞是由于TCP子系统中的Linux XFRM ESP中逻辑错误引起的，该错误允许将任意字节写入只读文件的内核页面缓存。攻击者可利用该漏洞获得系统上的提升权限并获得根shell。
Severity
高
Patch Name
Linux Kernel Fragnesia权限提升漏洞的补丁
Patch Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel Fragnesia存在权限提升漏洞，该漏洞是由于TCP子系统中的Linux XFRM ESP中逻辑错误引起的，该错误允许将任意字节写入只读文件的内核页面缓存。攻击者可利用该漏洞获得系统上的提升权限并获得根shell。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/v12-security/pocs/tree/main/fragnesia

Reference
https://github.com/v12-security/pocs/tree/main/fragnesia
Impacted products
Name
Linux Linux kernel
Show details on source website
To clipboard 

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-46300"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\n\nLinux Kernel Fragnesia\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8eTCP\u5b50\u7cfb\u7edf\u4e2d\u7684Linux XFRM ESP\u4e2d\u903b\u8f91\u9519\u8bef\u5f15\u8d77\u7684\uff0c\u8be5\u9519\u8bef\u5141\u8bb8\u5c06\u4efb\u610f\u5b57\u8282\u5199\u5165\u53ea\u8bfb\u6587\u4ef6\u7684\u5185\u6838\u9875\u9762\u7f13\u5b58\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u5f97\u7cfb\u7edf\u4e0a\u7684\u63d0\u5347\u6743\u9650\u5e76\u83b7\u5f97\u6839shell\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/v12-security/pocs/tree/main/fragnesia",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-21361",
  "openTime": "2026-05-22",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux Kernel Fragnesia\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8eTCP\u5b50\u7cfb\u7edf\u4e2d\u7684Linux XFRM ESP\u4e2d\u903b\u8f91\u9519\u8bef\u5f15\u8d77\u7684\uff0c\u8be5\u9519\u8bef\u5141\u8bb8\u5c06\u4efb\u610f\u5b57\u8282\u5199\u5165\u53ea\u8bfb\u6587\u4ef6\u7684\u5185\u6838\u9875\u9762\u7f13\u5b58\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u5f97\u7cfb\u7edf\u4e0a\u7684\u63d0\u5347\u6743\u9650\u5e76\u83b7\u5f97\u6839shell\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Linux Kernel Fragnesia\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Linux  Linux kernel"
  },
  "referenceLink": "https://github.com/v12-security/pocs/tree/main/fragnesia",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-22",
  "title": "Linux Kernel Fragnesia\u6743\u9650\u63d0\u5347\u6f0f\u6d1e"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.