xfrm: espintcp: do not reuse an in-progress partial send_CVE-2026-52935

{
    "lastseen": "",
    "description": "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->partial.\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->skmsg and reuse ctx->partial while the old\ntransfer still owns that state.\n\nDo not rebuild the send message when ctx->partial is still in progress.\nIf espintcp_push_msgs() returns with emsg->len 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.",
    "published": "2026-06-24T07:14:25.988Z",
    "modified": "2026-06-28T06:36:56.763Z",
    "type": "cve",
    "title": "xfrm: espintcp: do not reuse an in-progress partial send",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630\nhttps://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6\nhttps://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3\nhttps://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2\nhttps://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421\nhttps://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990\nhttps://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f\nhttps://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928",
    "id": "CVE-2026-52935",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\nLinux Linux 5.6",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}