CVE-2026-52935

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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": 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"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52935", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "6564e9c7af7e1dc7bfe7f3093b728abe484d7630", "versionType": "git"}, {"status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "1777ceac4bea5e568a5ad44b7f9bb219c1db21b6", "versionType": "git"}, {"status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3", "versionType": "git"}, {"status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "aa82a078f70f7ff88ba7d1017134e79d1ac140f2", "versionType": "git"}, {"status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "ba21439302db9a82fe4edbed1e38a97271529421", "versionType": 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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."}], "id": "CVE-2026-52935", "lastModified": "2026-10-19T20:18:48.303", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52935", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:23:01.117587Z", "version": "2.0.3"}}]}, "published": "2026-06-24T08:16:23.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": 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"type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xfrm: espintcp: do not reuse an in-progress partial send", "id": "2492098", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492098"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel. The `espintcp` component, responsible for handling encrypted network traffic, incorrectly reuses a partial data transmission state. This can lead to an out-of-bounds read, which may allow an attacker to access sensitive information or cause other memory corruption issues."], "name": "CVE-2026-52935", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52935\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52935\nhttps://lore.kernel.org/linux-cve-announce/2026062433-CVE-2026-52935-7909@gregkh/T"], "threat_severity": "Moderate"}

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