CVE-2026-31618

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"https://git.kernel.org/stable/c/8f98b81fe011e1879e6a7b1247e69e06a5e17af2"}], "title": "fbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.258", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.175", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.136", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.83", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.24", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.14", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E2D9D9DF-0F25-43D5-9C6A-4C891E3A29FC", "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.12.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8", "versionEndExcluding": "6.12.83", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": 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vulnerability has been resolved:\n\nfbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO\n\nMuch like commit 19f953e74356 (\"fbdev: fb_pm2fb: Avoid potential divide\nby zero error\"), we also need to prevent that same crash from happening\nin the udlfb driver as it uses pixclock directly when dividing, which\nwill crash."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: tdfxfb: evitar divisi\u00f3n por cero en FBIOPUT_VSCREENINFO\n\nAl igual que el commit 19f953e74356 (\u2019fbdev: fb_pm2fb: Evitar posible error de divisi\u00f3n por cero\u2019), tambi\u00e9n necesitamos evitar que ocurra el mismo fallo en el controlador udlfb, ya que utiliza pixclock directamente al dividir, lo que provocar\u00e1 un fallo."}], "id": "CVE-2026-31618", "lastModified": "2026-11-11T23:10:00.263", "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": "2026-04-24T15:16:41.080", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f207e46c62688bb7eb4e3feaf9a0d94020fb0c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53cb4e79a07124d2ebe502983c29800104080b47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59bde9e0930efef1286768cb65fc78d5e5267f93"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/63dfb0b4741f46d65b667c4275132b3d1966acc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6567d3e1aaadfebf44ce7dc9ea2630323cd4c736"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c05191598eca87a87329b3f6e4a0825775f09cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/859a239d58a812b61267d9944b701affe6a6244e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8f98b81fe011e1879e6a7b1247e69e06a5e17af2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc386daa6846551a88d338ba9864fc2812cd9030"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-369"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO", "id": "2461563", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461563"}, "csaw": false, "cwe": "CWE-369", "details": ["A flaw was found in the Linux kernel's fbdev subsystem, specifically affecting the tdfxfb and udlfb drivers. This vulnerability allows a local attacker to trigger a divide-by-zero error when performing the FBIOPUT_VSCREENINFO operation. This can lead to a system crash, resulting in a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-31618", "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": "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31618\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31618\nhttps://lore.kernel.org/linux-cve-announce/2026042424-CVE-2026-31618-baf8@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,859a239d58a812b61267d9944b701affe6a6244e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,53cb4e79a07124d2ebe502983c29800104080b47)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,fc386daa6846551a88d338ba9864fc2812cd9030)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6567d3e1aaadfebf44ce7dc9ea2630323cd4c736)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,63dfb0b4741f46d65b667c4275132b3d1966acc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8f98b81fe011e1879e6a7b1247e69e06a5e17af2)"}}], "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": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.136,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.83,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.1,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T20:10:31.999349+00:00", "value": {"mitigation_remediation": ["Update the kernel to a version that includes the commit fixing the divide\u2011by\u2011zero fault in tdfxfb.", "If an immediate kernel upgrade is not possible, recompile the kernel with the tdfxfb module disabled or configure the system to deny users access to the /dev/fb* devices, thereby preventing the vulnerable ioctl from being invoked.", "Additionally, enforce strict file\u2011system permissions on the framebuffer devices so that only trusted, privileged users can perform ioctl operations; consider using SELinux or AppArmor to restrict framebuffer access further."], "summary": {"action": "Apply Patch", "impact": "Denial of Service (kernel crash)"}, "threat_synthesis": {"affected_systems": "The flaw exists in the Linux kernel\u2019s fbdev subsystem, specifically the tdfxfb driver. It is present in any kernel that ships the tdfxfb driver and accepts the FBIOPUT_VSCREENINFO ioctl. No exact version range is provided, so all kernels containing that driver are considered affected until patched.", "description_and_impact": "This vulnerability stems from a divide\u2011by\u2011zero error in the Linux kernel\u2019s tdfxfb framebuffer driver when the FBIOPUT_VSCREENINFO ioctl is called. The flaw triggers a kernel crash, forcing a reboot or halt, and is classified as CWE\u2011369.", "risk_and_exploitability": "The EPSS score of < 1 % indicates a very low likelihood of exploitation, and the vulnerability is not listed in the CISA KEV catalog. The CVSS score of 5.5 suggests a medium severity: an attacker who can send the offending ioctl, which requires local or privileged access, can force a system crash and thus cause a denial of service. The attack vector is inferred from the need to invoke the vulnerable ioctl on the framebuffer device."}}}}, "created": "2026-04-27T18:45:11.330621+00:00", "updated": "2026-04-28T20:15:26.825988+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}