{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52935", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.369Z", "datePublished": "2026-06-24T07:14:25.988Z", "dateUpdated": "2026-08-05T12:31:53.368Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:53.368Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached through local socket syscalls: an attacker creates/uses a TCP socket, sets `TCP_ULP` to `espintcp`, and calls send/sendmsg. It is not directly triggerable by unauthenticated network packets alone.\nAC:L - The attacker can create the needed partial-send condition by controlling the TCP peer or receiver behavior and filling the send buffer, then issuing another send. No race or condition outside attacker control is required.\nPR:L - Setting an already-registered TCP ULP does not require CAP_NET_ADMIN, and ordinary local users can create TCP sockets and call setsockopt/sendmsg. XFRM administration is privileged, but it is not required for this lowest-privilege path to `espintcp_sendmsg`.\nUI:N - Exploitation does not require any victim user action after the attacker has local code execution. The attacker directly drives the socket operations.\nS:U - The impact remains within the kernel and its managed resources on the same host. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The stale partial-send offset can produce an out-of-bounds read in the TCP send path, potentially exposing kernel memory through transmitted data. Because the read is not strictly bounded to a small fixed disclosure, high confidentiality impact is appropriate.\nI:H - The corrupted espintcp/sk_msg state can build invalid bvec/socket-buffer references and disturb page or send-buffer accounting, which is a plausible kernel memory integrity primitive. Under the required higher-severity rule for uncertainty, this is scored as high integrity impact.\nA:H - The invalid scatterlist/bvec state can lead to kernel warnings, invalid page references, refcount/accounting corruption, or crashes in the send/cleanup path. A local attacker can repeat the trigger, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xfrm/espintcp.c" ], "versions": [ { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "6564e9c7af7e1dc7bfe7f3093b728abe484d7630", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "1777ceac4bea5e568a5ad44b7f9bb219c1db21b6", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "aa82a078f70f7ff88ba7d1017134e79d1ac140f2", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "ba21439302db9a82fe4edbed1e38a97271529421", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "37487d55bf3300e3d2c1368da5c2bd3e3834ea4f", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "c381039ade2e161ab08c0eda73c4f8b9a7115928", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xfrm/espintcp.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.1" } ] } ] } ], "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" } } } }