CVE-2026-45940

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Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"], "versions": [{"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "a7fe1d75e087862bc4087f3fcdfd5e291b9d9caa", "status": "affected", "versionType": "git"}, {"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "107e169f963920b11fa3c1bb384c077fe7330696", "status": "affected", "versionType": "git"}, {"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "92b45c99311ac4f3857cccee47059c4fb067fd4d", "status": "affected", "versionType": "git"}, {"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609", "status": "affected", "versionType": "git"}, {"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "36f81cb7d82e9614a7058da6abdf2e3a03993df1", "status": "affected", "versionType": "git"}, {"version": "ec222003bd948de8f3ffbca522d328af1a8452ad", "lessThan": "babab1b42ed68877ef669a08384becf281ad2582", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"], "versions": [{"version": "5.4", "status": "affected"}, {"version": "0", "lessThan": "5.4", "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": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "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": "5.4", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a7fe1d75e087862bc4087f3fcdfd5e291b9d9caa"}, {"url": "https://git.kernel.org/stable/c/107e169f963920b11fa3c1bb384c077fe7330696"}, {"url": "https://git.kernel.org/stable/c/92b45c99311ac4f3857cccee47059c4fb067fd4d"}, {"url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"}, {"url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"}, {"url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"}], "title": "net: stmmac: fix oops when split header is enabled", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-45940", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:02:28.444778Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:03:15.617Z"}}]}}

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Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.114", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.14", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.4", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:25:45.615Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45940", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:03:15.617Z", "dateReserved": "2026-05-13T15:03:33.087Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-27T12:17:56.350Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not."}], "id": "CVE-2026-45940", "lastModified": "2026-11-06T16:18:53.183", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45940", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:02:28.444778Z", "version": "2.0.3"}}]}, "published": "2026-05-27T14:17:10.193", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/107e169f963920b11fa3c1bb384c077fe7330696"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/92b45c99311ac4f3857cccee47059c4fb067fd4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a7fe1d75e087862bc4087f3fcdfd5e291b9d9caa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: stmmac: fix oops when split header is enabled", "id": "2482164", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482164"}, "csaw": false, "cwe": "CWE-805", "details": ["A flaw was found in the Linux kernel's `stmmac` Ethernet driver. When split header functionality is enabled for GMAC4, the hardware may not fully populate a buffer in the first descriptor. This can lead to an incorrect calculation of buffer length in subsequent descriptors, resulting in a kernel panic (oops) and causing a Denial of Service (DoS) to the system. This issue can be triggered under specific network conditions."], "name": "CVE-2026-45940", "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": "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": "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": "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"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45940\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45940\nhttps://lore.kernel.org/linux-cve-announce/2026052729-CVE-2026-45940-4159@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ec222003bd948de8f3ffbca522d328af1a8452ad,b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ec222003bd948de8f3ffbca522d328af1a8452ad,36f81cb7d82e9614a7058da6abdf2e3a03993df1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ec222003bd948de8f3ffbca522d328af1a8452ad,babab1b42ed68877ef669a08384becf281ad2582)"}}], "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": "5.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.14,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.4,6.20.0)"}}, {"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": "2026-05-27T19:00:16.896904+00:00", "title": "Kernel Crash via Miscalculated Receive Descriptor Length in stmmac Driver", "updated": "2026-08-14T03:00:04.588415+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}