{"id":"AZL-100424","summary":"CVE-2026-81013 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: hp-bioscfg: fix heap OOB read on empty password write\n\nvalidate_password_input() computes length = strlen(buf) and then\nchecks buf[length - 1] to strip a trailing newline, without checking\nthat length is nonzero first. Writing an empty string (a bare '\\n')\nto current_password or new_password gives length == 0, and\nbuf[length - 1] reads buf[-1], one byte before the heap allocation\nholding the copied input.\n\nKASAN confirms this directly:\n\n  BUG: KASAN: slab-out-of-bounds in store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]\n  Read of size 1 at addr ffff88811bd8da9f by task sh/13740\n  ...\n  store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]\n  current_password_store+0x14/0x20 [hp_bioscfg]\n  ...\n  The buggy address is located 23 bytes to the right of\n  allocated 8-byte region [ffff88811bd8da80, ffff88811bd8da88)\n\nReproduced identically via new_password_store. Execution continues\npast the bad read (the garbage byte only affects whether \"length\" is\ndecremented by one), so the write completes and returns success; this\nis a pure information read past the buffer, not a crash, but it is\nstill an out-of-bounds access KASAN correctly flags.\n\nFix by only checking buf[length - 1] when length is nonzero.","modified":"2026-09-12T14:15:21.897473039Z","published":"2026-09-11T20:19:10Z","upstream":["CVE-2026-81013"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81013"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-100424.json"}}],"schema_version":"1.9.0"}