CVE-2026-43086

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43086", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.983Z", "datePublished": "2026-05-06T07:40:20.631Z", "dateUpdated": "2026-05-11T22:17:27.288Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:17:27.288Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix NULL deref in ip_vs_add_service error path\n\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\nvariable sched is set to NULL. If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc->scheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched->done_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n <TASK>\n ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind. ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc->scheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/ipvs/ip_vs_ctl.c"], "versions": [{"version": "705dd34440812735ece298eb5bc153fde9544d42", "lessThan": "730663352c9178f33fcf5929f4a37c1f1ca5a693", "status": "affected", "versionType": "git"}, {"version": "705dd34440812735ece298eb5bc153fde9544d42", "lessThan": "4039959315008888dd53c37674d33351817a5166", "status": "affected", "versionType": "git"}, {"version": "705dd34440812735ece298eb5bc153fde9544d42", "lessThan": "a32dabacee111cea083ddd57a03635672e1bff29", "status": "affected", "versionType": "git"}, {"version": "705dd34440812735ece298eb5bc153fde9544d42", "lessThan": "c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94", "status": "affected", "versionType": "git"}, {"version": "705dd34440812735ece298eb5bc153fde9544d42", "lessThan": "9a91797e61d286805ae10a92cc48959c30800556", "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/netfilter/ipvs/ip_vs_ctl.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.2", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693"}, {"url": "https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166"}, {"url": "https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29"}, {"url": "https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"}, {"url": "https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556"}], "title": "ipvs: fix NULL deref in ip_vs_add_service error path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc->scheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched->done_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n <TASK>\n ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind. ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc->scheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call."}], "id": "CVE-2026-43086", "lastModified": "2026-06-17T10:48:54.630", "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"}]}, "published": "2026-05-06T10:16:21.837", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipvs: fix NULL deref in ip_vs_add_service error path", "id": "2466993", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466993"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-43086", "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": "Out of support scope", "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": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43086\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43086\nhttps://lore.kernel.org/linux-cve-announce/2026050616-CVE-2026-43086-2b1f@gregkh/T"], "threat_severity": "Moderate"}

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