CVE-2026-68441

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68441", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.394Z", "datePublished": "2026-08-12T00:07:30.669Z", "dateUpdated": "2026-10-30T12:28:37.360Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:28:37.360Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Handle TC_ACT_REDIRECT from qdisc filter chains\n\nWhen a TC filter attached to a qdisc filter chain returns\nTC_ACT_REDIRECT (ex: via an eBPF program calling bpf_redirect() or an\nact_bpf action), the redirect was silently lost i.e no qdisc classify\nfunction handled TC_ACT_REDIRECT, so the packet fell through the\nswitch and was enqueued normally instead of being redirected.\n\nThis has been broken since bpf_redirect() was introduced for TC in\ncommit 27b29f63058d (\"bpf: add bpf_redirect() helper\"). We got lucky\nfor a long time because bpf_net_context was a per-CPU variable that\nwas always available.\n\ncommit 401cb7dae813 (\"net: Reference bpf_redirect_info via task_struct\non PREEMPT_RT.\") turned bpf_net_context into a task_struct member that\nis only set up by explicit callers. Without a caller setting it up,\nbpf_redirect() itself crashes with a NULL pointer dereference in\nbpf_net_ctx_get_ri(). However, even with bpf_net_context available,\nTC_ACT_REDIRECT from qdisc filter chains cannot be honored without\nadding skb_do_redirect() calls to every qdisc classify function, which\nwould require changes across net/sched/. Isolate it to ebpf core where\nit belongs.\n\nInstead, add a tcf_classify_qdisc() inline helper in pkt_cls.h, as a\nwrapper around tcf_classify() for use by qdisc classify functions and\ntcf_qevent_handle(). When the classify verdict is TC_ACT_REDIRECT,\nthe wrapper converts it to TC_ACT_SHOT, dropping the packet rather\nthan letting it continue silently. Dropping is preferred over\nletting the packet through because the user immediately sees packet\nloss. Silently passing the packet through would hide the problem and\nleave the user wondering why their redirect is not working.\n\nThe clsact fast path, tc_run() continues to call tcf_classify() directly\nand is unaffected: TC_ACT_REDIRECT is returned as-is and handled by\nsch_handle_egress/ingress() calling skb_do_redirect() as before."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/pkt_cls.h", "net/sched/cls_api.c", "net/sched/sch_cake.c", "net/sched/sch_drr.c", "net/sched/sch_dualpi2.c", "net/sched/sch_ets.c", "net/sched/sch_fq_codel.c", "net/sched/sch_fq_pie.c", "net/sched/sch_hfsc.c", "net/sched/sch_htb.c", "net/sched/sch_multiq.c", "net/sched/sch_prio.c", "net/sched/sch_qfq.c", "net/sched/sch_sfb.c", "net/sched/sch_sfq.c"], "versions": [{"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "06629ed4d0ecba55bc425eaea79974484fe0b414", "status": "affected", "versionType": "git"}, {"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "98ca831065c4d20baf97dc9e232777dc47a2b923", "status": "affected", "versionType": "git"}, {"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "636658e50b5c6a2c93413a9fa6d9da768dbfdaf2", "status": "affected", "versionType": "git"}, {"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "9cbad9c8125f5fe377c0800ab08f7196eab44456", "status": "affected", "versionType": "git"}, {"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781", "status": "affected", "versionType": "git"}, {"version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "lessThan": "ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/pkt_cls.h", "net/sched/cls_api.c", "net/sched/sch_cake.c", "net/sched/sch_drr.c", "net/sched/sch_dualpi2.c", "net/sched/sch_ets.c", "net/sched/sch_fq_codel.c", "net/sched/sch_fq_pie.c", "net/sched/sch_hfsc.c", "net/sched/sch_htb.c", "net/sched/sch_multiq.c", "net/sched/sch_prio.c", "net/sched/sch_qfq.c", "net/sched/sch_sfb.c", "net/sched/sch_sfq.c"], "versions": [{"version": "4.4", "status": "affected"}, {"version": "0", "lessThan": "4.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "4.4", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/06629ed4d0ecba55bc425eaea79974484fe0b414"}, {"url": "https://git.kernel.org/stable/c/98ca831065c4d20baf97dc9e232777dc47a2b923"}, {"url": "https://git.kernel.org/stable/c/636658e50b5c6a2c93413a9fa6d9da768dbfdaf2"}, {"url": "https://git.kernel.org/stable/c/9cbad9c8125f5fe377c0800ab08f7196eab44456"}, {"url": "https://git.kernel.org/stable/c/c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781"}, {"url": "https://git.kernel.org/stable/c/ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e"}], "title": "net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/net/pkt_cls.h", "net/sched/cls_api.c", "net/sched/sch_cake.c", "net/sched/sch_drr.c", "net/sched/sch_dualpi2.c", "net/sched/sch_ets.c", "net/sched/sch_fq_codel.c", "net/sched/sch_fq_pie.c", "net/sched/sch_hfsc.c", "net/sched/sch_htb.c", "net/sched/sch_multiq.c", "net/sched/sch_prio.c", "net/sched/sch_qfq.c", "net/sched/sch_sfb.c", "net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "06629ed4d0ecba55bc425eaea79974484fe0b414", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}, {"lessThan": "98ca831065c4d20baf97dc9e232777dc47a2b923", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}, {"lessThan": "636658e50b5c6a2c93413a9fa6d9da768dbfdaf2", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}, {"lessThan": "9cbad9c8125f5fe377c0800ab08f7196eab44456", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}, {"lessThan": "c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}, {"lessThan": "ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e", "status": "affected", "version": "27b29f63058d26c6c1742f1993338280d5a41dc6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/net/pkt_cls.h", "net/sched/cls_api.c", "net/sched/sch_cake.c", "net/sched/sch_drr.c", "net/sched/sch_dualpi2.c", "net/sched/sch_ets.c", "net/sched/sch_fq_codel.c", "net/sched/sch_fq_pie.c", "net/sched/sch_hfsc.c", "net/sched/sch_htb.c", "net/sched/sch_multiq.c", "net/sched/sch_prio.c", "net/sched/sch_qfq.c", "net/sched/sch_sfb.c", "net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.4"}, {"lessThan": "4.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "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\nnet/sched: Handle TC_ACT_REDIRECT from qdisc filter chains\n\nWhen a TC filter attached to a qdisc filter chain returns\nTC_ACT_REDIRECT (ex: via an eBPF program calling bpf_redirect() or an\nact_bpf action), the redirect was silently lost i.e no qdisc classify\nfunction handled TC_ACT_REDIRECT, so the packet fell through the\nswitch and was enqueued normally instead of being redirected.\n\nThis has been broken since bpf_redirect() was introduced for TC in\ncommit 27b29f63058d (\"bpf: add bpf_redirect() helper\"). We got lucky\nfor a long time because bpf_net_context was a per-CPU variable that\nwas always available.\n\ncommit 401cb7dae813 (\"net: Reference bpf_redirect_info via task_struct\non PREEMPT_RT.\") turned bpf_net_context into a task_struct member that\nis only set up by explicit callers. Without a caller setting it up,\nbpf_redirect() itself crashes with a NULL pointer dereference in\nbpf_net_ctx_get_ri(). However, even with bpf_net_context available,\nTC_ACT_REDIRECT from qdisc filter chains cannot be honored without\nadding skb_do_redirect() calls to every qdisc classify function, which\nwould require changes across net/sched/. Isolate it to ebpf core where\nit belongs.\n\nInstead, add a tcf_classify_qdisc() inline helper in pkt_cls.h, as a\nwrapper around tcf_classify() for use by qdisc classify functions and\ntcf_qevent_handle(). When the classify verdict is TC_ACT_REDIRECT,\nthe wrapper converts it to TC_ACT_SHOT, dropping the packet rather\nthan letting it continue silently. Dropping is preferred over\nletting the packet through because the user immediately sees packet\nloss. Silently passing the packet through would hide the problem and\nleave the user wondering why their redirect is not working.\n\nThe clsact fast path, tc_run() continues to call tcf_classify() directly\nand is unaffected: TC_ACT_REDIRECT is returned as-is and handled by\nsch_handle_egress/ingress() calling skb_do_redirect() as before."}], "id": "CVE-2026-68441", "lastModified": "2026-10-30T13:19:45.573", "metrics": {}, "published": "2026-08-12T00:17:44.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06629ed4d0ecba55bc425eaea79974484fe0b414"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/636658e50b5c6a2c93413a9fa6d9da768dbfdaf2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/98ca831065c4d20baf97dc9e232777dc47a2b923"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9cbad9c8125f5fe377c0800ab08f7196eab44456"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains", "id": "2514451", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514451"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: Handle TC_ACT_REDIRECT from qdisc filter chains\nWhen a TC filter attached to a qdisc filter chain returns\nTC_ACT_REDIRECT (ex: via an eBPF program calling bpf_redirect() or an\nact_bpf action), the redirect was silently lost i.e no qdisc classify\nfunction handled TC_ACT_REDIRECT, so the packet fell through the\nswitch and was enqueued normally instead of being redirected.\nThis has been broken since bpf_redirect() was introduced for TC in\ncommit 27b29f63058d (\"bpf: add bpf_redirect() helper\"). We got lucky\nfor a long time because bpf_net_context was a per-CPU variable that\nwas always available.\ncommit 401cb7dae813 (\"net: Reference bpf_redirect_info via task_struct\non PREEMPT_RT.\") turned bpf_net_context into a task_struct member that\nis only set up by explicit callers. Without a caller setting it up,\nbpf_redirect() itself crashes with a NULL pointer dereference in\nbpf_net_ctx_get_ri(). However, even with bpf_net_context available,\nTC_ACT_REDIRECT from qdisc filter chains cannot be honored without\nadding skb_do_redirect() calls to every qdisc classify function, which\nwould require changes across net/sched/. Isolate it to ebpf core where\nit belongs.\nInstead, add a tcf_classify_qdisc() inline helper in pkt_cls.h, as a\nwrapper around tcf_classify() for use by qdisc classify functions and\ntcf_qevent_handle(). When the classify verdict is TC_ACT_REDIRECT,\nthe wrapper converts it to TC_ACT_SHOT, dropping the packet rather\nthan letting it continue silently. Dropping is preferred over\nletting the packet through because the user immediately sees packet\nloss. Silently passing the packet through would hide the problem and\nleave the user wondering why their redirect is not working.\nThe clsact fast path, tc_run() continues to call tcf_classify() directly\nand is unaffected: TC_ACT_REDIRECT is returned as-is and handled by\nsch_handle_egress/ingress() calling skb_do_redirect() as before.", "A flaw was found in the Linux kernel's networking scheduler (net/sched). When a Traffic Control (TC) filter, configured with an eBPF program or act_bpf action, attempts to redirect a packet, the redirection is silently ignored. This causes the packet to be processed normally instead of being redirected, potentially leading to unexpected network behavior or a bypass of intended traffic management policies."], "name": "CVE-2026-68441", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68441\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68441\nhttps://lore.kernel.org/linux-cve-announce/2026081256-CVE-2026-68441-dcd7@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27b29f63058d26c6c1742f1993338280d5a41dc6,c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27b29f63058d26c6c1742f1993338280d5a41dc6,ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e)"}}], "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": "4.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc5, *]"}}], "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": "2026-08-12T15:15:02.674895+00:00", "updated": "2026-08-13T13:45:03.821904+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}