CVE-2026-74708

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Reject the request when the registered metadata area does\nnot contain the complete field.\n\nSnapshot the validated flags for the generic transmit path and use that\nsnapshot for request and completion processing, avoiding inconsistent\ndecisions if user space changes the flags concurrently.\n\nNote that only xsk_skb_metadata is properly using the flags,\n__xsk_buff_get_metadata ignores them. Next commits address that."}], "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 - Exploitation requires a local process to create an AF_XDP socket, register UMEM/TX rings via setsockopt, bind to a netdev queue, and submit TX descriptors; the bug is hit in kernel transmit handling, not by remote packet delivery alone.\nAC:L - An attacker fully controls UMEM layout, metadata flags, and TX ring timing, so registering tx_metadata_len=16, setting XDP_TXMD_FLAGS_LAUNCH_TIME, and racing concurrent flag writes can reliably trigger the out-of-bounds launch_time read without uncontrollable kernel preconditions.\nPR:L - AF_XDP socket creation checks CAP_NET_RAW in the socket network namespace (xsk_create), which unprivileged local users can obtain via user/network namespaces; no init-namespace root or admin rights are required beyond that capability.\nUI:N - No victim interaction is needed after the attacker can run code with CAP_NET_RAW; they directly configure UMEM metadata, enqueue TX descriptors, and drive transmission via sendmsg/poll without requiring another user to open files or mount filesystems.\nS:U - Impact stays within the kernel networking stack and attacker-controlled AF_XDP context on the same host; it does not cross VM, container-to-host, or IOMMU security boundaries into a different authority.\nC:H - With only 16 bytes of registered TX metadata, enabling launch-time offload makes the kernel read meta->request.launch_time eight bytes beyond the declared metadata area; this is an out-of-bounds read whose contents are then consumed by kernel TX processing.\nI:H - The out-of-bounds launch_time value is written into skb->skb_mstamp_ns on the generic path and can be passed to NIC launch-time hardware offload on zerocopy drivers, letting an attacker influence kernel packet scheduling state and device transmit timing from attacker-chosen memory.\nA:H - Repeated transmission with attacker-controlled launch-time values can disrupt TX scheduling and stress hardware offload paths (mlx5/igc/stmmac), enabling denial of service through stalled or mis-timed transmission rather than only a single benign misread."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/xdp_sock_drv.h", "net/xdp/xsk.c"], "versions": [{"version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "lessThan": "af511afa1d2977f384044df78d6fbf9fba653f7a", "status": "affected", "versionType": "git"}, {"version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "lessThan": "bc63d47611c07b0d5d655fe1a590861931527920", "status": "affected", "versionType": "git"}, {"version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "lessThan": "439ce2dddf3d22129b9113a7881637256a35e936", "status": "affected", "versionType": "git"}, {"version": "d9d736c416c9a85f84e15435ba82a177262e745b", "status": "affected", "versionType": "git"}, {"version": "6.14.2", "lessThan": "6.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/xdp_sock_drv.h", "net/xdp/xsk.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.15", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a"}, {"url": "https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920"}, {"url": "https://git.kernel.org/stable/c/439ce2dddf3d22129b9113a7881637256a35e936"}], "title": "xsk: validate launch-time metadata size", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74708", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:15:12.386738Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:16:10.891Z"}}]}}

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Reject the request when the registered metadata area does\nnot contain the complete field.\n\nSnapshot the validated flags for the generic transmit path and use that\nsnapshot for request and completion processing, avoiding inconsistent\ndecisions if user space changes the flags concurrently.\n\nNote that only xsk_skb_metadata is properly using the flags,\n__xsk_buff_get_metadata ignores them. Next commits address that."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.14.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:51.238Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74708", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:16:10.891Z", "dateReserved": "2026-08-15T05:44:03.927Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:33:05.956Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/net/xdp_sock_drv.h", "net/xdp/xsk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "af511afa1d2977f384044df78d6fbf9fba653f7a", "status": "affected", "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "versionType": "git"}, {"lessThan": "bc63d47611c07b0d5d655fe1a590861931527920", "status": "affected", "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "versionType": "git"}, {"lessThan": "439ce2dddf3d22129b9113a7881637256a35e936", "status": "affected", "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0", "versionType": "git"}, {"status": "affected", "version": "d9d736c416c9a85f84e15435ba82a177262e745b", "versionType": "git"}, {"lessThan": "6.15", "status": "affected", "version": "6.14.2", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/net/xdp_sock_drv.h", "net/xdp/xsk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: validate launch-time metadata size\n\nLaunch-time metadata extends beyond the first 16 bytes of struct\nxsk_tx_metadata. Reject the request when the registered metadata area does\nnot contain the complete field.\n\nSnapshot the validated flags for the generic transmit path and use that\nsnapshot for request and completion processing, avoiding inconsistent\ndecisions if user space changes the flags concurrently.\n\nNote that only xsk_skb_metadata is properly using the flags,\n__xsk_buff_get_metadata ignores them. Next commits address that."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxsk: validar el tama\u00f1o de los metadatos en tiempo de lanzamiento\n\nLos metadatos en tiempo de lanzamiento se extienden m\u00e1s all\u00e1 de los primeros 16 bytes de struct xsk_tx_metadata. Rechazar la solicitud cuando el \u00e1rea de metadatos registrada no contiene el campo completo.\n\nTomar una instant\u00e1nea de los flags validados para la ruta de transmisi\u00f3n gen\u00e9rica y usar esa instant\u00e1nea para el procesamiento de solicitudes y finalizaciones, evitando decisiones inconsistentes si el espacio de usuario cambia los flags concurrentemente.\n\nTenga en cuenta que solo xsk_skb_metadata est\u00e1 utilizando correctamente los flags, __xsk_buff_get_metadata los ignora. Los pr\u00f3ximos commits abordan eso."}], "id": "CVE-2026-74708", "lastModified": "2026-10-16T20:17:53.607", "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-2026-74708", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:15:12.386738Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:45.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/439ce2dddf3d22129b9113a7881637256a35e936"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: xsk: validate launch-time metadata size", "id": "2521499", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521499"}, "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-1284", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxsk: validate launch-time metadata size\nLaunch-time metadata extends beyond the first 16 bytes of struct\nxsk_tx_metadata. Reject the request when the registered metadata area does\nnot contain the complete field.\nSnapshot the validated flags for the generic transmit path and use that\nsnapshot for request and completion processing, avoiding inconsistent\ndecisions if user space changes the flags concurrently.\nNote that only xsk_skb_metadata is properly using the flags,\n__xsk_buff_get_metadata ignores them. Next commits address that.", "A flaw was found in the Linux kernel's xsk (AF_XDP socket) component. This vulnerability arises from improper validation of launch-time metadata size, where the metadata can extend beyond its allocated structure. This could lead to inconsistent decisions if user space concurrently changes flags, potentially resulting in a denial of service or other undefined behavior."], "name": "CVE-2026-74708", "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": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74708\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74708\nhttps://lore.kernel.org/linux-cve-announce/2026082237-CVE-2026-74708-e2a3@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ca4419f15abd19ba8be1e109661b60f9f5b6c9f0,af511afa1d2977f384044df78d6fbf9fba653f7a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ca4419f15abd19ba8be1e109661b60f9f5b6c9f0,bc63d47611c07b0d5d655fe1a590861931527920)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ca4419f15abd19ba8be1e109661b60f9f5b6c9f0,439ce2dddf3d22129b9113a7881637256a35e936)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d9d736c416c9a85f84e15435ba82a177262e745b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.14.2,6.15)"}}], "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": "semver", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-22T18:15:03.689848+00:00", "updated": "2026-08-25T14:30:19.029121+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-1284"]}