CVE-2026-31482

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That\ncommit removed TIF_ISOLATE_BP, dropping both the branch prediction\nmacros and the r12 load, but did not add r12 to the register clearing\nsequence.\n\nAdd the missing xgr %r12,%r12 to make the register scrub consistent\nacross all entry points."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ns390/entry: Limpiar el registro r12 al entrar al kernel\n\nAntes del commit f33f2d4c7c80 (\u2019s390/bp: remove TIF_ISOLATE_BP\u2019), todos los manejadores de entrada cargaban r12 con el puntero de la tarea actual (lg %r12,__LC_CURRENT) para uso de las macros BPENTER/BPEXIT. Ese commit elimin\u00f3 TIF_ISOLATE_BP, descartando tanto las macros de predicci\u00f3n de ramas como la carga de r12, pero no a\u00f1adi\u00f3 r12 a la secuencia de limpieza de registros.\n\nA\u00f1adir el xgr %r12,%r12 faltante para hacer que la limpieza del registro sea consistente en todos los puntos de entrada."}], "id": "CVE-2026-31482", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31482", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:34:38.810147Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:45.457", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: s390/entry: Scrub r12 register on kernel entry", "id": "2460705", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460705"}, "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-909", "details": ["A flaw was found in the Linux kernel, specifically within the s390 architecture's kernel entry process. Due to an incomplete update, a critical register (r12) was not properly cleared when entering the kernel. This oversight could allow a local user to potentially access sensitive system information, such as the current task pointer, which should not be exposed."], "name": "CVE-2026-31482", "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": "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": "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": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31482\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31482\nhttps://lore.kernel.org/linux-cve-announce/2026042258-CVE-2026-31482-b482@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780,a58d298a83a3a9b7ca99ded9d60a1e77231159ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780,95c899cd791803a5bf7b73e5994fbbe1cc1a9c36)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780,7f4e3233faa8470dd0627bc49b2809f2bfebd909)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780,99a8b420f3f0e162eb9c9c9253929d4d23f9bd30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780,0738d395aab8fae3b5a3ad3fc640630c91693c27)"}}], "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": "6.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"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"}], "analysis": {"en": {"generated_at": "2026-04-28T15:37:19.356150+00:00", "value": {"mitigation_remediation": ["Apply a Linux kernel update that includes the r12 register clearing commit", "Restart the system to load the updated kernel", "If an immediate kernel update is not possible, limit execution of untrusted kernel modules or use mandatory access controls as a temporary safeguard"], "summary": {"action": "Immediate Patch", "impact": "Information Disclosure"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases for s390 hardware that do not include the commit adding the r12 register clearing. No specific kernel version numbers are listed in the advisory, so any older kernel lacking the patch is potentially affected.", "description_and_impact": "The Linux kernel for s390 processors fails to clear the r12 register when entering kernel mode. A prior commit removed the load of the current task pointer into r12 and the patch that should have scrubbed this value was omitted. The lingering register contents may expose a pointer to the current task, allowing a local attacker to read or infer sensitive kernel data.", "risk_and_exploitability": "The EPSS score of < 1% indicates a low likelihood of exploitation, and the vulnerability is not listed in CISA KEV. Because the flaw involves a register only manipulated during kernel entry, the attack vector is presumably local or requires elevated privileges. The CVSS score of 7.0 classifies this issue as high severity, indicating that an attacker could achieve information disclosure if they can exploit the register leakage."}}}}, "created": "2026-04-22T17:45:22.661122+00:00", "updated": "2026-04-28T15:45:06.375013+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-863", "CWE-909"]}