{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593"
            },
            {
              "fixed": "6564e9c7af7e1dc7bfe7f3093b728abe484d7630"
            },
            {
              "fixed": "1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"
            },
            {
              "fixed": "8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3"
            },
            {
              "fixed": "aa82a078f70f7ff88ba7d1017134e79d1ac140f2"
            },
            {
              "fixed": "ba21439302db9a82fe4edbed1e38a97271529421"
            },
            {
              "fixed": "f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990"
            },
            {
              "fixed": "37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"
            },
            {
              "fixed": "c381039ade2e161ab08c0eda73c4f8b9a7115928"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52935.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: do not reuse an in-progress partial send\n\nespintcp keeps a single in-flight transmit in ctx-\u003epartial.\nBefore building a new sk_msg, espintcp_sendmsg() first tries to flush\nthat state through espintcp_push_msgs().\n\nFor blocking callers, espintcp_push_msgs() may return success even when\nthe previous partial send is still pending. espintcp_sendmsg() would\nthen reinitialize emsg-\u003eskmsg and reuse ctx-\u003epartial while the old\ntransfer still owns that state.\n\nDo not rebuild the send message when ctx-\u003epartial is still in progress.\nIf espintcp_push_msgs() returns with emsg-\u003elen still set, fail the new\nsend instead of overwriting the live partial state.\n\nThis is a memory-safety fix: reusing the live partial-send state can\nleave a stale offset attached to a new sk_msg and lead to an out-of-\nbounds read in the send path.\n\ntcp_sendmsg_locked() already handles waiting for send buffer memory, so\nthe fix here is just to preserve espintcp's one-message-at-a-time\ntransmit state.",
  "id": "CVE-2026-52935",
  "modified": "2026-07-09T03:52:08.916403389Z",
  "published": "2026-06-24T07:14:25.988Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52935.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52935"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xfrm: espintcp: do not reuse an in-progress partial send"
}