GHSA-9XWW-VMQG-JH2Q

Vulnerability from github – Published: 2026-06-24 09:30 – Updated: 2026-06-28 09:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

xfrm: espintcp: do not reuse an in-progress partial send

espintcp keeps a single in-flight transmit in ctx->partial. Before building a new sk_msg, espintcp_sendmsg() first tries to flush that state through espintcp_push_msgs().

For blocking callers, espintcp_push_msgs() may return success even when the previous partial send is still pending. espintcp_sendmsg() would then reinitialize emsg->skmsg and reuse ctx->partial while the old transfer still owns that state.

Do not rebuild the send message when ctx->partial is still in progress. If espintcp_push_msgs() returns with emsg->len still set, fail the new send instead of overwriting the live partial state.

This is a memory-safety fix: reusing the live partial-send state can leave a stale offset attached to a new sk_msg and lead to an out-of- bounds read in the send path.

tcp_sendmsg_locked() already handles waiting for send buffer memory, so the fix here is just to preserve espintcp's one-message-at-a-time transmit state.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-52935"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T08:16:23Z",
    "severity": "HIGH"
  },
  "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\u0027s one-message-at-a-time\ntransmit state.",
  "id": "GHSA-9xww-vmqg-jh2q",
  "modified": "2026-06-28T09:31:36Z",
  "published": "2026-06-24T09:30:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52935"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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