{"id":"CVE-2026-52935","revision":null,"records":[{"revision":"ff557922f5694550bdd333110fe1ff0d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52935","aliases":[],"title":"xfrm: espintcp: do not reuse an in-progress partial send","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.","state":0,"publishedAt":"2026-06-24T07:14:25.988+00:00","modifiedAt":"2026-10-19T19:47:08.44+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/xfrm/espintcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"6564e9c7af7e1dc7bfe7f3093b728abe484d7630\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"1777ceac4bea5e568a5ad44b7f9bb219c1db21b6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"aa82a078f70f7ff88ba7d1017134e79d1ac140f2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"ba21439302db9a82fe4edbed1e38a97271529421\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"37487d55bf3300e3d2c1368da5c2bd3e3834ea4f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n \"lessThan\": \"c381039ade2e161ab08c0eda73c4f8b9a7115928\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/xfrm/espintcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.94\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.36\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.13\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630","https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6","https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3","https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2","https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421","https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990","https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f","https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52935","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52935","identifiers":["CVE-2026-52935"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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