{"id":"CVE-2026-52935","title":"xfrm: espintcp: do not reuse an in-progress partial send","summary":"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() f…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 6564e9c7af7e1dc7bfe7f3093b728abe484d7630","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < aa82a078f70f7ff88ba7d1017134e79d1ac140f2","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < ba21439302db9a82fe4edbed1e38a97271529421","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 37487d55bf3300e3d2c1368da5c2bd3e3834ea4f","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < c381039ade2e161ab08c0eda73c4f8b9a7115928","Linux 5.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:23:01.117587Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:20.919Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52935","references":[{"url":"https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630"},{"url":"https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"},{"url":"https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3"},{"url":"https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2"},{"url":"https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421"},{"url":"https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990"},{"url":"https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"},{"url":"https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"}],"tags":["cve.org"],"epss":0.0012,"epssPercentile":0.01714,"ingestedAt":"2026-10-16T17:24:46.721Z","slug":"CVE-2026-52935","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 6564e9c7af7e1dc7bfe7f3093b728abe484d7630`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < aa82a078f70f7ff88ba7d1017134e79d1ac140f2`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < ba21439302db9a82fe4edbed1e38a97271529421`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 37487d55bf3300e3d2c1368da5c2bd3e3834ea4f`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < c381039ade2e161ab08c0eda73c4f8b9a7115928`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}