CVE-2026-52935 (GCVE-0-2026-52935)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-10-19 19:47
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.94\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.36\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.13\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:31:53.368Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-52935\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:47:08.440Z\", \"dateReserved\": \"2026-06-09T07:44:35.369Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-24T07:14:25.988Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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