{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64207", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.769Z", "datePublished": "2026-07-20T16:27:54.447Z", "dateUpdated": "2026-07-20T16:27:54.447Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T16:27:54.447Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: dualpi2: fix GSO backlog accounting\n\nWhen DualPI2 splits a GSO skb into N segments, it propagates N\nadditional packets to its parent before returning NET_XMIT_SUCCESS.\nThe parent then accounts for the original skb once more, leaving its\nqlen one larger than the number of packets actually queued.\n\nWith QFQ as the parent, after all real packets are dequeued, QFQ still\nhas a non-zero qlen while its in-service aggregate has no active\nclasses. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes\nthe result to qfq_peek_skb(), causing a NULL pointer dereference.\n\nFollow the same pattern used by tbf_segment() and taprio: count only\nsuccessfully queued segments, propagate the difference between the\noriginal skb and those segments, and return NET_XMIT_SUCCESS whenever\nat least one segment was queued."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_dualpi2.c"], "versions": [{"version": "8f9516daedd67097a0c6e463fcb7a42b5ee9d477", "lessThan": "c4b70c1512b8f9f33f23c2c8196dfd1210207681", "status": "affected", "versionType": "git"}, {"version": "8f9516daedd67097a0c6e463fcb7a42b5ee9d477", "lessThan": "806586e33891066487db1f002be3d455cda6b516", "status": "affected", "versionType": "git"}, {"version": "8f9516daedd67097a0c6e463fcb7a42b5ee9d477", "lessThan": "05ed733b65ab977dd931e7f7ac0f62fdb81205c2", "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/sched/sch_dualpi2.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "6.17", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c4b70c1512b8f9f33f23c2c8196dfd1210207681"}, {"url": "https://git.kernel.org/stable/c/806586e33891066487db1f002be3d455cda6b516"}, {"url": "https://git.kernel.org/stable/c/05ed733b65ab977dd931e7f7ac0f62fdb81205c2"}], "title": "net/sched: dualpi2: fix GSO backlog accounting", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: net/sched: dualpi2: fix GSO backlog accounting", "id": "2502893", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502893"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's DualPI2 (Dual-rate PI2) queue discipline. This vulnerability arises from incorrect accounting of Generic Segmentation Offload (GSO) backlog, where the parent queue (such as QFQ - Hierarchical Fair Queueing) miscalculates the number of queued packets. This miscalculation can lead to a NULL pointer dereference when the system attempts to dequeue packets from an inactive class, resulting in a system crash and a Denial of Service (DoS) condition."], "name": "CVE-2026-64207", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64207\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64207\nhttps://lore.kernel.org/linux-cve-announce/2026072053-CVE-2026-64207-e76b@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f9516daedd67097a0c6e463fcb7a42b5ee9d477,c4b70c1512b8f9f33f23c2c8196dfd1210207681)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f9516daedd67097a0c6e463fcb7a42b5ee9d477,806586e33891066487db1f002be3d455cda6b516)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f9516daedd67097a0c6e463fcb7a42b5ee9d477,05ed733b65ab977dd931e7f7ac0f62fdb81205c2)"}}], "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": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-07-20T23:45:04.950869+00:00", "updated": "2026-07-20T23:45:04.950908+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}