CVE-2026-31520

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{"bugzilla": {"description": "kernel: HID: apple: avoid memory leak in apple_report_fixup()", "id": "2460675", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460675"}, "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-772", "details": ["A flaw was found in the Linux kernel. Specifically, within the HID (Human Interface Device) Apple driver, the `apple_report_fixup()` function did not properly free a newly allocated memory buffer. This memory leak could lead to resource exhaustion, potentially causing system instability or a denial of service (DoS) for a local user."], "name": "CVE-2026-31520", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31520\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31520\nhttps://lore.kernel.org/linux-cve-announce/2026042211-CVE-2026-31520-a81f@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e2f090aeb7b9930a964e151910f4d45b04c8a7e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,2635d0c715f3fb177e0f80ecd5fa48feb6bf3884)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,31860c3f7ac66ab897a8c90dc4e74fa17ca0b624)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,be1a341c161430282acdfe2ac99b413271575cf1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e652ebd29928181c3e6820e303da25873e9917d4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,239c15116d80f67d32f00acc34575f1a6b699613)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"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": "2026-04-28T23:57:18.215988+00:00", "value": {"mitigation_remediation": ["Upgrade the kernel to a version that includes the apple_report_fixup() memory\u2011leak fix.", "If a patch is not yet available, unload or blacklist the Apple HID driver to prevent the faulty routine from executing.", "As a temporary precaution, block or disconnect Apple HID devices until the kernel is updated or the driver is removed."], "summary": {"action": "Apply Patch", "impact": "Memory Leak (Resource Exhaustion)"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases that contain the unmodified apple HID are affected, as the vulnerability exists in versions prior to the commit that introduced the fix. Users running a kernel with the legacy apple_report_fixup() implementation, regardless of distribution, are exposed.", "description_and_impact": "The apple_report_fixup() function in the Linux kernel allocates a new buffer with kmemdup() but never releases it, leading to a memory leak. This flaw is a classic example of improper memory deallocation (CWE\u2011401) and also improper resource management (CWE\u2011772), and can cause the kernel to gradually consume available memory, potentially resulting in a system-wide denial\u2011of\u2011service.", "risk_and_exploitability": "The CVSS score of 5.5 indicates a medium severity. The EPSS score of less than 1% suggests a low probability of exploitation at the present time, and the vulnerability is not listed in CISA\u2019s KEV catalog, pointing to limited known exploitation. However, based on the description, it is inferred that an attacker who can repeatedly trigger the Apple HID report processing\u2014such as by connecting affected devices or via a compromised local user\u2014could provoke the kernel to leak memory until resources are exhausted. The vulnerability does not provide code execution or privilege escalation; it primarily poses a risk of resource depletion."}}}}, "created": "2026-04-22T19:30:24.549610+00:00", "updated": "2026-04-29T00:00:13.843178+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}