CVE-2026-43057

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It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is reachable through the network transmit stack when remotely supplied traffic is forwarded or tunneled by an affected Linux system. A remote peer can trigger the bad GSO/offload decision by sending suitable IPv6 tunneled traffic with extension headers through a preconfigured tunnel/router deployment.\nAC:L - There is no race or probabilistic condition; once the affected tunnel and NETIF_F_IPV6_CSUM-capable egress device are present, crafted large/GSO-eligible IPv6 traffic deterministically reaches the flawed feature check. The attacker controls the packet shape needed to hit the fallback error.\nPR:N - For the network forwarding/tunnel scenario, the attacker does not need local credentials or administrative privileges on the vulnerable host. Tunnel setup requires CAP_NET_ADMIN, but exploitation of an already deployed tunnel path is pre-authenticated network traffic.\nUI:N - No victim user action is required. The vulnerable code runs automatically during packet forwarding/transmission.\nS:U - The bug affects the kernel networking stack and availability of traffic handled by the same system. It does not cross a distinct security authority such as a guest-to-host or IOMMU boundary.\nC:N - The bug is a checksum/GSO feature-selection error and does not expose kernel memory or packet contents beyond normal transmission. No information disclosure primitive was identified.\nI:N - The issue can cause incorrect checksum/offload handling for affected packets, but it does not provide an attacker with a meaningful unauthorized data modification primitive. The practical effect is packet loss or malformed traffic rather than controlled integrity compromise.\nA:H - The related failure mode is repeated bad offload handling, warnings, packet drops, and collapse of affected tunnel throughput. A remote attacker can repeatedly trigger loss of availability for the vulnerable network path."}]}], "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": "a0478d7e888028f85fa7785ea838ce0ca09398e2", "lessThan": "2094a7cf91b71367b649f991aacc7b579f793d0b", "status": "affected", "versionType": "git"}, {"version": "2156d9e9f2e483c8c3906c0ea57ea312c1424235", "lessThan": "ed71cf465c75f5688b07a35d373cd1d6b589c8ea", "status": "affected", "versionType": "git"}, {"version": "041e2f945f82fdbd6fff577b79c33469430297aa", "lessThan": "33670f780e0120c3dacda188c512bbffe0b6044c", "status": "affected", "versionType": "git"}, {"version": "864e3396976ef41de6cc7bc366276bf4e084fff2", "lessThan": "a98b78116a27e2a57b696b569b2cb431c95cf9b6", "status": "affected", "versionType": "git"}, {"version": "864e3396976ef41de6cc7bc366276bf4e084fff2", 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"6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "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": "6.1.149", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*", "matchCriteriaId": "5A4516A6-C12E-42A4-8C0E-68AEF3264504", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*", "matchCriteriaId": "3963C3A0-CEA1-4F5C-8011-3A593ABB684D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: manejar correctamente el tr\u00e1fico tunelizado en el fallback GSO de IPV6_CSUM\n\nNETIF_F_IPV6_CSUM solo anuncia soporte para la descarga de checksum de paquetes sin cabeceras de extensi\u00f3n IPv6. Los paquetes con cabeceras de extensi\u00f3n deben recurrir al checksumming por software. Dado que TSO depende de la descarga de checksum, esos deben revertir a GSO.\n\nEl commit a continuaci\u00f3n introduce ese fallback. Siempre verifica la longitud de la cabecera de red. Para paquetes tunelizados, la longitud de la cabecera interna debe verificarse en su lugar. Extender la verificaci\u00f3n en consecuencia.\n\nUn caso especial son los paquetes tunelizados sin protocolo IP interno. Tales como RFC 6951 SCTP en UDP. Esos no son IPv6 est\u00e1ndar seguido de una cabecera de transporte tampoco, por lo que tambi\u00e9n deben revertir a la ruta GSO por software."}], "id": "CVE-2026-43057", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-01T15:16:52.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback", "id": "2464420", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464420"}, "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-358", "details": ["A flaw was found in the Linux kernel's networking subsystem. Incorrect handling of tunneled IPv6 traffic, specifically when processing packets with IPv6 extension headers or without an inner IP protocol, can cause the system to improperly revert to a software processing path. This issue may lead to a denial of service due to degraded network performance or dropped packets."], "name": "CVE-2026-43057", "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": "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43057\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43057\nhttps://lore.kernel.org/linux-cve-announce/2026050108-CVE-2026-43057-4807@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a0478d7e888028f85fa7785ea838ce0ca09398e2,2094a7cf91b71367b649f991aacc7b579f793d0b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2156d9e9f2e483c8c3906c0ea57ea312c1424235,ed71cf465c75f5688b07a35d373cd1d6b589c8ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[041e2f945f82fdbd6fff577b79c33469430297aa,33670f780e0120c3dacda188c512bbffe0b6044c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[864e3396976ef41de6cc7bc366276bf4e084fff2,a98b78116a27e2a57b696b569b2cb431c95cf9b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[864e3396976ef41de6cc7bc366276bf4e084fff2,732fdeb2987c94b439d51f5cb9addddc2fc48c42)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[864e3396976ef41de6cc7bc366276bf4e084fff2,c4336a07eb6b2526dc2b62928b5104b41a7f81f5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "794ddbb7b63b6828c75967b9bcd43b086716e7a1"}}], "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": "semver", "value": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"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": "2026-05-01T20:30:05.025651+00:00", "updated": "2026-05-06T21:45:13.040901+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}