{"api_version":"1","generated_at":"2026-06-24T12:16:58+00:00","cve":"CVE-2026-52935","urls":{"html":"https://cve.report/CVE-2026-52935","api":"https://cve.report/api/cve/CVE-2026-52935.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52935","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52935"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 08:16:23","updated_at":"2026-06-24 08:16:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630","name":"https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990","name":"https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928","name":"https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6","name":"https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2","name":"https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421","name":"https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3","name":"https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f","name":"https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52935","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52935","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 6564e9c7af7e1dc7bfe7f3093b728abe484d7630 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 aa82a078f70f7ff88ba7d1017134e79d1ac140f2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ba21439302db9a82fe4edbed1e38a97271529421 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 37487d55bf3300e3d2c1368da5c2bd3e3834ea4f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 c381039ade2e161ab08c0eda73c4f8b9a7115928 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/xfrm/espintcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6564e9c7af7e1dc7bfe7f3093b728abe484d7630","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"1777ceac4bea5e568a5ad44b7f9bb219c1db21b6","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"aa82a078f70f7ff88ba7d1017134e79d1ac140f2","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"ba21439302db9a82fe4edbed1e38a97271529421","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"37487d55bf3300e3d2c1368da5c2bd3e3834ea4f","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"c381039ade2e161ab08c0eda73c4f8b9a7115928","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/xfrm/espintcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-06-24T07:14:25.988Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"xfrm: espintcp: do not reuse an in-progress partial send","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52935","datePublished":"2026-06-24T07:14:25.988Z","dateReserved":"2026-06-09T07:44:35.369Z","dateUpdated":"2026-06-24T07:14:25.988Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 08:16:23","lastModifiedDate":"2026-06-24 08:16:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52935","Ordinal":"1","Title":"xfrm: espintcp: do not reuse an in-progress partial send","CVE":"CVE-2026-52935","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52935","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"xfrm: espintcp: do not reuse an in-progress partial send"}]}}}