CVE-2026-43042

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This can lead to OOB accesses.\n\nThis patch adds a seqcount, so that we get a consistent snapshot.\n\nNote that mpls_label_ok is also susceptible to this, so the check\nagainst RTA_DST in rtm_to_route_config, done outside platform_mutex,\nis not sufficient. This value gets passed to mpls_label_ok once more\nin both mpls_route_add and mpls_route_del, so there is no issue, but\nthat additional check must not be removed."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The self-contained exploit path is local: the attacker races writes to /proc/sys/net/mpls/platform_labels with rtnetlink RTM_GETROUTE dumps in the same network namespace. Remote MPLS packets can reach one reader path, but a remote-only attacker cannot perform the required table resize.\nAC:L - The vulnerable condition is a race, but a local attacker can control both sides by repeatedly resizing platform_labels and issuing concurrent route dumps or packet processing. No external timing or victim state is required beyond retrying the race.\nPR:L - Writing the MPLS platform_labels sysctl requires CAP_NET_ADMIN over the target network namespace. That capability is reachable by an unprivileged user through a user namespace plus network namespace, so this is low privilege rather than high privilege.\nUI:N - No victim user action is required. The attacker can trigger the resize and reader paths directly.\nS:U - The bug is within the kernel networking/MPLS subsystem and impacts the same kernel security authority. It is not a VM escape or cross-authority boundary bypass.\nC:H - The inconsistent platform_labels/platform_label snapshot can cause out-of-bounds reads of the route pointer table and dereference attacker-influenced or adjacent kernel memory as mpls_route data. Through the route dump path this can disclose kernel memory, so confidentiality is high.\nI:N - The bug is an out-of-bounds read/dereference of the route table pointer array, not an out-of-bounds write or direct memory corruption primitive. The investigated paths do not provide a defensible arbitrary kernel data modification primitive.\nA:H - The race can make readers index a NULL, stale, or too-small platform_label array and dereference invalid pointers. This can reliably lead to kernel oops/panic or other high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netns/mpls.h", "net/mpls/af_mpls.c"], "versions": [{"version": "7720c01f3f590116882e251f13c7e1d5602f8643", "lessThan": "6b9184ebc936f791631e51e783ab30320b3770e4", "status": "affected", "versionType": "git"}, {"version": "7720c01f3f590116882e251f13c7e1d5602f8643", "lessThan": "0d377825548fe598595b5a5fa4a309fb593d8fb4", "status": "affected", "versionType": "git"}, {"version": "7720c01f3f590116882e251f13c7e1d5602f8643", "lessThan": "8adc5b6fc876928d8c95555d30b66fa50b07421e", "status": "affected", "versionType": "git"}, {"version": "7720c01f3f590116882e251f13c7e1d5602f8643", "lessThan": "5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef", "status": "affected", "versionType": "git"}, {"version": "7720c01f3f590116882e251f13c7e1d5602f8643", "lessThan": "629ec78ef8608d955ce217880cdc3e1873af3a15", "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/netns/mpls.h", "net/mpls/af_mpls.c"], "versions": [{"version": "4.1", "status": "affected"}, {"version": "0", "lessThan": "4.1", "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": "6.19.12", "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": "4.1", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6b9184ebc936f791631e51e783ab30320b3770e4"}, {"url": "https://git.kernel.org/stable/c/0d377825548fe598595b5a5fa4a309fb593d8fb4"}, {"url": "https://git.kernel.org/stable/c/8adc5b6fc876928d8c95555d30b66fa50b07421e"}, {"url": "https://git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef"}, {"url": "https://git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15"}], "title": "mpls: add seqcount to protect the platform_label{,s} pair", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43042", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:13:53.309258Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:10.994Z"}}]}}

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This can lead to OOB accesses.\n\nThis patch adds a seqcount, so that we get a consistent snapshot.\n\nNote that mpls_label_ok is also susceptible to this, so the check\nagainst RTA_DST in rtm_to_route_config, done outside platform_mutex,\nis not sufficient. This value gets passed to mpls_label_ok once more\nin both mpls_route_add and mpls_route_del, so there is no issue, but\nthat additional check must not be removed."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmpls: a\u00f1adir seqcount para proteger el par platform_label{,s}\n\nLas rutas de c\u00f3digo protegidas por RCU (mpls_forward, mpls_dump_routes) pueden tener una vista inconsistente de platform_labels frente a platform_label en caso de un redimensionamiento concurrente (resize_platform_label_table, bajo platform_mutex). Esto puede llevar a accesos OOB.\n\nEste parche a\u00f1ade un seqcount, para que obtengamos una instant\u00e1nea consistente.\n\nTenga en cuenta que mpls_label_ok tambi\u00e9n es susceptible a esto, por lo que la comprobaci\u00f3n contra RTA_DST en rtm_to_route_config, realizada fuera de platform_mutex, no es suficiente. Este valor se pasa a mpls_label_ok una vez m\u00e1s tanto en mpls_route_add como en mpls_route_del, por lo que no hay problema, pero esa comprobaci\u00f3n adicional no debe ser eliminada."}], "id": "CVE-2026-43042", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43042", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:13:53.309258Z", "version": "2.0.3"}}]}, "published": "2026-05-01T15:16:50.423", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d377825548fe598595b5a5fa4a309fb593d8fb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b9184ebc936f791631e51e783ab30320b3770e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8adc5b6fc876928d8c95555d30b66fa50b07421e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: mpls: add seqcount to protect the platform_label{,s} pair", "id": "2464429", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464429"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's Multiprotocol Label Switching (MPLS) module. This vulnerability is caused by a race condition where concurrent operations on network label data can lead to inconsistent memory access. This can result in out-of-bounds memory reads or writes, potentially causing system instability or a denial of service."], "name": "CVE-2026-43042", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43042\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43042\nhttps://lore.kernel.org/linux-cve-announce/2026050104-CVE-2026-43042-8e66@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7720c01f3f590116882e251f13c7e1d5602f8643,5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7720c01f3f590116882e251f13c7e1d5602f8643,629ec78ef8608d955ce217880cdc3e1873af3a15)"}}], "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": "4.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-01T23:15:29.372748+00:00", "updated": "2026-10-23T08:30:09.479871+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}