{ "cveId": "CVE-2026-99063", "url": "https://patchblox.com/security/cve/CVE-2026-99063", "summary": "CVE-2026-99063 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-99063, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "dm ioctl: don\u0027t let data_start run past the buffer", "description": "In the Linux kernel, the following vulnerability has been resolved: dm ioctl: don\u0027t let data_start run past the buffer struct dm_ioctl has seven bytes of trailing padding, so the smallest buffer userspace is allowed to ask for, offsetof(struct dm_ioctl, data), is seven bytes shorter than sizeof(struct dm_ioctl). get_result_buffer() sets data_start to sizeof(struct dm_ioctl) without looking at how big the buffer actually is. Ask for the minimum and data_start ends up seven bytes past the end. Callers add it to data_size, and ctl_ioctl() copies that much back to userspace: BUG: KASAN: slab-out-of-bounds in _copy_to_user\u002B0xad/0xd0 Read of size 312 at addr ffff8880169e4c00 by task repro-dm/140 ctl_ioctl\u002B0x5e3/0xcb0 dm_ctl_ioctl\u002B0x25/0x40 allocated 305-byte region [ffff8880169e4c00, ffff8880169e4d31) A DM_LIST_DEVICES with data_size set to 305 is enough to hit it, and the seven bytes that leak are whatever sat next to the allocation. Clamp data_start to the buffer size. Note that this is not a security bug because the out-of-bounds read can only be triggered by root.", "published": "2026-10-23T13:17:30Z", "severity": "Low", "cvss": 2.3, "epss": 0.00177, "epssPercentile": 0.07301, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99063", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel-livepatch-6.12.113-138.209", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-devel", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-headers", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.12.113-1", "fix": "DEBIAN-CVE-2026-99063", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99063", "released": "2026-10-24T13:25:57Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.11-1", "fix": "DEBIAN-CVE-2026-99063", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99063", "released": "2026-10-24T13:25:57Z" }, { "platform": "linux", "product": "perf6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "perf6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T19:12:23Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }