Vulnerability-Lookup

CNVD-2026-21360

Vulnerability from cnvd - Published: 2026-05-22

Title

Linux kernel Dirty Frag权限提升漏洞（CNVD-2026-21360）

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 Dirty Frag存在权限提升漏洞，该漏洞源于rxrpc中DATA和RESPONSE数据包处理时未对分页片段进行分离，攻击者可利用该漏洞导致就地解密路径绑定外部分页片段。

Severity

高

Patch Name

Linux kernel Dirty Frag权限提升漏洞（CNVD-2026-21360）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 Dirty Frag存在权限提升漏洞，该漏洞源于rxrpc中DATA和RESPONSE数据包处理时未对分页片段进行分离，攻击者可利用该漏洞导致就地解密路径绑定外部分页片段。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://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c

Reference

https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c

Impacted products

Name
['Linux Linux kernel >5.3，<6.18.29', 'Linux Linux kernel >=6.19，<7.0.6', 'Linux Linux kernel 5.3', 'Linux Linux kernel 5.3 rc7', 'Linux Linux kernel 5.3 rc8', 'Linux Linux kernel 7.1 rc1', 'Linux Linux kernel 7.1 rc2']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-43500",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-43500"
    }
  },
  "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 Dirty Frag\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8erxrpc\u4e2dDATA\u548cRESPONSE\u6570\u636e\u5305\u5904\u7406\u65f6\u672a\u5bf9\u5206\u9875\u7247\u6bb5\u8fdb\u884c\u5206\u79bb\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5c31\u5730\u89e3\u5bc6\u8def\u5f84\u7ed1\u5b9a\u5916\u90e8\u5206\u9875\u7247\u6bb5\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://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-21360",
  "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 Dirty Frag\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8erxrpc\u4e2dDATA\u548cRESPONSE\u6570\u636e\u5305\u5904\u7406\u65f6\u672a\u5bf9\u5206\u9875\u7247\u6bb5\u8fdb\u884c\u5206\u79bb\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5c31\u5730\u89e3\u5bc6\u8def\u5f84\u7ed1\u5b9a\u5916\u90e8\u5206\u9875\u7247\u6bb5\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 Dirty Frag\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2026-21360\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Linux Linux kernel \u003e5.3\uff0c\u003c6.18.29",
      "Linux Linux kernel \u003e=6.19\uff0c\u003c7.0.6",
      "Linux Linux kernel 5.3",
      "Linux Linux kernel 5.3 rc7",
      "Linux Linux kernel 5.3 rc8",
      "Linux Linux kernel 7.1 rc1",
      "Linux Linux kernel 7.1 rc2"
    ]
  },
  "referenceLink": "https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-12",
  "title": "Linux kernel Dirty Frag\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2026-21360\uff09"
}

CVE-2026-43500 (GCVE-0-2026-43500)

Vulnerability from cvelistv5 – Published: 2026-05-11 06:26 – Updated: 2026-09-01 12:05

Title

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 15:51 UTC

CWE

CWE-787 - Out-of-bounds Write
CWE-123 - Write-what-where Condition

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/7c504ffab3efce8f7…
https://git.kernel.org/stable/c/3711382a77342a9a1…
https://git.kernel.org/stable/c/3eae0f4f9f7206a48…
https://git.kernel.org/stable/c/d45179f8795222ce8…
https://git.kernel.org/stable/c/aa54b1d27fe0c2b78…
https://github.com/V4bel/dirtyfrag	exploit
https://access.redhat.com/security/cve/CVE-2026-43500	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2468273	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

8 products

Vendor	Product	Version
Linux	Linux	Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < 7c504ffab3efce8f7e4f463b314ae31030bdf18b (git) Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < 3711382a77342a9a1c3d2e7330dcfc7ea927f568 (git) Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c (git) Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < d45179f8795222ce858770dc619abe51f9d24411 (git) Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.29 , ≤ 6.18.* (semver) Unaffected: 7.0.6 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

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          {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Also unshare DATA/RESPONSE packets when paged frags are present\n\nThe DATA-packet handler in rxrpc_input_call_event() and the RESPONSE\nhandler in rxrpc_verify_response() copy the skb to a linear one before\ncalling into the security ops only when skb_cloned() is true.  An skb\nthat is not cloned but still carries externally-owned paged fragments\n(e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via\n__ip_append_data, or a chained skb_has_frag_list()) falls through to\nthe in-place decryption path, which binds the frag pages directly into\nthe AEAD/skcipher SGL via skb_to_sgvec().\n\nExtend the gate to also unshare when skb_has_frag_list() or\nskb_has_shared_frag() is true.  This catches the splice-loopback vector\nand other externally-shared frag sources while preserving the\nzero-copy fast path for skbs whose frags are kernel-private (e.g. NIC\npage_pool RX, GRO).  The OOM/trace handling already in place is reused."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The exploitable shared-fragment condition is created locally by sending RxRPC-shaped UDP data with splice/vmsplice/sendfile-backed pages into the local receive path; ordinary remote packets do not provide attacker-owned page frags on the receiver.\nAC:L - No race or hard-to-control timing is required; an attacker can construct the packet shape and encrypted contents needed to reach the in-place decryption path.\nPR:L - The attacker needs local code execution to create sockets and use splice-backed UDP transmission, but AF_RXRPC socket creation and the relevant send path do not require administrative privileges.\nUI:N - After the local attacker runs code, exploitation does not require a victim user to open files, mount filesystems, or take any other action.\nS:U - The vulnerability affects kernel memory/page-cache handling within the same host security authority and is not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - The bug is a memory/page-cache corruption primitive caused by decrypting directly into externally owned skb fragments, and successful privilege escalation would allow broad disclosure of protected data.\nI:H - The attacker can influence plaintext written by in-place decryption into shared backing pages, making high-impact data modification and privilege escalation defensible.\nA:H - Corrupting shared packet/page backing storage can destabilize kernel consumers or corrupt critical data, making kernel crash or severe service disruption plausible."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:28:23.115Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568"
        },
        {
          "url": "https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71"
        }
      ],
      "title": "rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43500",
    "datePublished": "2026-05-11T06:26:45.838Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-09-01T12:05:00.158Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CNVD-2026-21360

CVE-2026-43500 (GCVE-0-2026-43500)

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