CVE-2026-53365

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If the loop breaks early the uarg is never allocated at all,\nleaking pinned pages with no completion notification.\n\nFix this by following the approach used by TCP: allocate the zerocopy\nuarg (if not provided by the caller) before the send loop and attach\nit to every skb via skb_zcopy_set(), which takes a reference per skb.\nEach skb's completion properly decrements the refcount, and the\nnotification only fires after the last skb is freed.\nOn failure, if no data was sent, the uarg is cleanly aborted via\nnet_zcopy_put_abort().\n\nThis issue was initially discovered by sashiko while reviewing commit\n1cb36e252211 (\"vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\")\nbut was pre-existing."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/vmw_vsock/virtio_transport_common.c"], "versions": [{"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "76b995bc57bd90cb6e954e1966fbd8786da47f0d", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "b3155f2b78db21e99256bcf7eb902f24ff6d5338", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "ae38d9179190a956e2a87a69ef1dd6f451b51c4d", "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/vmw_vsock/virtio_transport_common.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "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": "6.7", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9"}, {"url": "https://git.kernel.org/stable/c/76b995bc57bd90cb6e954e1966fbd8786da47f0d"}, {"url": "https://git.kernel.org/stable/c/b3155f2b78db21e99256bcf7eb902f24ff6d5338"}, {"url": "https://git.kernel.org/stable/c/ae38d9179190a956e2a87a69ef1dd6f451b51c4d"}], "title": "vsock/virtio: fix zerocopy completion for multi-skb sends", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-404", "lang": "en", "description": "CWE-404 Improper Resource Shutdown or Release"}]}], "references": [{"url": "https://github.com/MaherAzzouzi/vsockdrop", "tags": ["exploit"]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-08-18T03:55:24.397803Z", "id": "CVE-2026-53365", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-18T13:29:37.454Z"}}]}}

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If the loop breaks early the uarg is never allocated at all,\nleaking pinned pages with no completion notification.\n\nFix this by following the approach used by TCP: allocate the zerocopy\nuarg (if not provided by the caller) before the send loop and attach\nit to every skb via skb_zcopy_set(), which takes a reference per skb.\nEach skb's completion properly decrements the refcount, and the\nnotification only fires after the last skb is freed.\nOn failure, if no data was sent, the uarg is cleanly aborted via\nnet_zcopy_put_abort().\n\nThis issue was initially discovered by sashiko while reviewing commit\n1cb36e252211 (\"vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\")\nbut was pre-existing."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/vmw_vsock/virtio_transport_common.c"], "versions": [{"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "76b995bc57bd90cb6e954e1966fbd8786da47f0d", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "b3155f2b78db21e99256bcf7eb902f24ff6d5338", "status": "affected", "versionType": "git"}, {"version": "581512a6dc939ef122e49336626ae159f3b8a345", "lessThan": "ae38d9179190a956e2a87a69ef1dd6f451b51c4d", "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/vmw_vsock/virtio_transport_common.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "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": "6.7", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9"}, {"url": "https://git.kernel.org/stable/c/76b995bc57bd90cb6e954e1966fbd8786da47f0d"}, {"url": "https://git.kernel.org/stable/c/b3155f2b78db21e99256bcf7eb902f24ff6d5338"}, {"url": "https://git.kernel.org/stable/c/ae38d9179190a956e2a87a69ef1dd6f451b51c4d"}], "title": "vsock/virtio: fix zerocopy completion for multi-skb sends", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-53365", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-18T03:55:24.397803Z"}}}], "references": [{"url": "https://github.com/MaherAzzouzi/vsockdrop", "tags": ["exploit"]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-404", "description": "CWE-404 Improper Resource Shutdown or Release"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-17T13:41:30.337Z"}}]}}

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If the loop breaks early the uarg is never allocated at all,\nleaking pinned pages with no completion notification.\n\nFix this by following the approach used by TCP: allocate the zerocopy\nuarg (if not provided by the caller) before the send loop and attach\nit to every skb via skb_zcopy_set(), which takes a reference per skb.\nEach skb's completion properly decrements the refcount, and the\nnotification only fires after the last skb is freed.\nOn failure, if no data was sent, the uarg is cleanly aborted via\nnet_zcopy_put_abort().\n\nThis issue was initially discovered by sashiko while reviewing commit\n1cb36e252211 (\"vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\")\nbut was pre-existing."}], "id": "CVE-2026-53365", "lastModified": "2026-08-18T14:17:10.330", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53365", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-18T03:55:24.397803Z", "version": "2.0.3"}}]}, "published": "2026-07-13T18:16:28.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/76b995bc57bd90cb6e954e1966fbd8786da47f0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae38d9179190a956e2a87a69ef1dd6f451b51c4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3155f2b78db21e99256bcf7eb902f24ff6d5338"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/MaherAzzouzi/vsockdrop"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-404"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: vsock/virtio: fix zerocopy completion for multi-skb sends", "id": "2499742", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499742"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvsock/virtio: fix zerocopy completion for multi-skb sends\nWhen a large message is fragmented into multiple skbs, the zerocopy\nuarg is only allocated and attached to the last skb in the loop.\nNon-final skbs carry pinned user pages with no completion tracking,\nso the kernel has no way to notify userspace when those pages are safe\nto reuse. If the loop breaks early the uarg is never allocated at all,\nleaking pinned pages with no completion notification.\nFix this by following the approach used by TCP: allocate the zerocopy\nuarg (if not provided by the caller) before the send loop and attach\nit to every skb via skb_zcopy_set(), which takes a reference per skb.\nEach skb's completion properly decrements the refcount, and the\nnotification only fires after the last skb is freed.\nOn failure, if no data was sent, the uarg is cleanly aborted via\nnet_zcopy_put_abort().\nThis issue was initially discovered by sashiko while reviewing commit\n1cb36e252211 (\"vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\")\nbut was pre-existing.", "A flaw was found in the Linux kernel's `vsock/virtio` component. This vulnerability occurs during zerocopy completion for large messages fragmented into multiple socket kernel buffers (skbs). An issue in how user arguments (uargs) are handled for these buffers can lead to pinned user pages not being properly tracked or released. This prevents the kernel from notifying userspace when these memory pages are safe to reuse, potentially leading to memory leaks or data corruption if pages are prematurely reallocated."], "name": "CVE-2026-53365", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53365\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53365\nhttps://lore.kernel.org/linux-cve-announce/2026071353-CVE-2026-53365-c6d2@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[581512a6dc939ef122e49336626ae159f3b8a345,76b995bc57bd90cb6e954e1966fbd8786da47f0d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[581512a6dc939ef122e49336626ae159f3b8a345,b3155f2b78db21e99256bcf7eb902f24ff6d5338)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[581512a6dc939ef122e49336626ae159f3b8a345,ae38d9179190a956e2a87a69ef1dd6f451b51c4d)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.7,6.7]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-13T19:30:04.351718+00:00", "updated": "2026-08-22T11:30:17.162396+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}