CVE-2026-43208

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43208", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.993Z", "datePublished": "2026-05-06T11:28:12.292Z", "dateUpdated": "2026-08-05T12:26:35.377Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:35.377Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not pass flow_id to set_rps_cpu()\n\nBlamed commit made the assumption that the RPS table for each receive\nqueue would have the same size, and that it would not change.\n\nCompute flow_id in set_rps_cpu(), do not assume we can use the value\ncomputed by get_rps_cpu(). Otherwise we risk out-of-bound access\nand/or crashes."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable `get_rps_cpu()`/`set_rps_cpu()` path is reached while processing received network packets through the generic RX path. In a reasonable high-performance server deployment with RFS/aRFS enabled, a remote peer can drive this path by sending traffic to an exposed service.\nAC:L - Once the affected RFS/aRFS configuration exists, exploitation does not require winning an attacker-uncontrolled race; packets and flows can be generated repeatedly to hit mismatched per-queue flow table indexes. The requirement for RFS/aRFS-capable hardware and configuration is a deployment precondition for the affected subsystem.\nPR:N - The packet-processing trigger itself requires no kernel privileges or authentication from the remote attacker. Enabling/resizing the RPS/RFS tables requires init-namespace `CAP_NET_ADMIN`, but that is administrator configuration, not attacker privilege in the scored network scenario.\nUI:N - No victim user action is required after the network service and RFS/aRFS configuration are present. The vulnerable path runs automatically during packet receive processing.\nS:U - The impact is within the Linux kernel/networking security authority. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The stale `flow_id` can cause out-of-bounds reads from kernel `rps_dev_flow_table` memory. Because this is kernel memory corruption adjacent to attacker-influenced packet flow state, high confidentiality impact is defensible.\nI:H - The same out-of-bounds `rps_dev_flow` access can write fields such as `filter`, `hash`, `last_qtail`, and `cpu` outside the allocated table. Kernel out-of-bounds write memory corruption is scored as high integrity impact.\nA:H - The fix explicitly cites out-of-bound access and crashes, and an invalid vmalloc-backed table access can oops or panic the kernel. Repeated remote traffic can retrigger the fault on vulnerable configured systems."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/dev.c"], "versions": [{"version": "48aa30443e52c9666d5cd5e67532e475f212337e", "lessThan": "5455a232edea6b946b99449f15ca771a8874a5a6", "status": "affected", "versionType": "git"}, {"version": "48aa30443e52c9666d5cd5e67532e475f212337e", "lessThan": "ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c", "status": "affected", "versionType": "git"}, {"version": "48aa30443e52c9666d5cd5e67532e475f212337e", "lessThan": "8a8a9fac9efa6423fd74938b940cb7d731780718", "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/core/dev.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "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": "6.18", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5455a232edea6b946b99449f15ca771a8874a5a6"}, {"url": "https://git.kernel.org/stable/c/ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c"}, {"url": "https://git.kernel.org/stable/c/8a8a9fac9efa6423fd74938b940cb7d731780718"}], "title": "net: do not pass flow_id to set_rps_cpu()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5455a232edea6b946b99449f15ca771a8874a5a6", "status": "affected", "version": "48aa30443e52c9666d5cd5e67532e475f212337e", "versionType": "git"}, {"lessThan": "ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c", "status": "affected", "version": "48aa30443e52c9666d5cd5e67532e475f212337e", "versionType": "git"}, {"lessThan": "8a8a9fac9efa6423fd74938b940cb7d731780718", "status": "affected", "version": "48aa30443e52c9666d5cd5e67532e475f212337e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.16", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E0D300DB-AA68-4962-981D-EF9F5E97AACF", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not pass flow_id to set_rps_cpu()\n\nBlamed commit made the assumption that the RPS table for each receive\nqueue would have the same size, and that it would not change.\n\nCompute flow_id in set_rps_cpu(), do not assume we can use the value\ncomputed by get_rps_cpu(). Otherwise we risk out-of-bound access\nand/or crashes."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: no pasar flow_id a set_rps_cpu()\n\nEl commit responsable asumi\u00f3 que la tabla RPS para cada cola de recepci\u00f3n tendr\u00eda el mismo tama\u00f1o y que no cambiar\u00eda.\n\nCalcular flow_id en set_rps_cpu(), no asumir que podemos usar el valor calculado por get_rps_cpu(). De lo contrario, corremos el riesgo de acceso fuera de l\u00edmites y/o ca\u00eddas."}], "id": "CVE-2026-43208", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-06T12:16:40.170", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5455a232edea6b946b99449f15ca771a8874a5a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a8a9fac9efa6423fd74938b940cb7d731780718"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: do not pass flow_id to set_rps_cpu()", "id": "2467081", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467081"}, "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-805", "details": ["A flaw was found in the Linux kernel's networking component. An incorrect assumption about the size and immutability of the Receive Packet Steering (RPS) table could lead to an out-of-bounds memory access. This vulnerability, occurring during the computation of `flow_id` in the `set_rps_cpu()` function, could result in system crashes or other unpredictable behavior, potentially leading to a Denial of Service (DoS)."], "name": "CVE-2026-43208", "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": "Under investigation", "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-2026-43208\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43208\nhttps://lore.kernel.org/linux-cve-announce/2026050648-CVE-2026-43208-cc6f@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48aa30443e52c9666d5cd5e67532e475f212337e,5455a232edea6b946b99449f15ca771a8874a5a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48aa30443e52c9666d5cd5e67532e475f212337e,ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48aa30443e52c9666d5cd5e67532e475f212337e,8a8a9fac9efa6423fd74938b940cb7d731780718)"}}], "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": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[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": "2026-05-06T15:00:07.175866+00:00", "updated": "2026-05-11T23:00:19.488741+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}