{"id":"AZL-80627","summary":"CVE-2026-23346 affecting package kernel for versions less than 6.6.143.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: io: Extract user memory type in ioremap_prot()\n\nThe only caller of ioremap_prot() outside of the generic ioremap()\nimplementation is generic_access_phys(), which passes a 'pgprot_t' value\ndetermined from the user mapping of the target 'pfn' being accessed by\nthe kernel. On arm64, the 'pgprot_t' contains all of the non-address\nbits from the pte, including the permission controls, and so we end up\nreturning a new user mapping from ioremap_prot() which faults when\naccessed from the kernel on systems with PAN:\n\n  | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000\n  | ...\n  | Call trace:\n  |   __memcpy_fromio+0x80/0xf8\n  |   generic_access_phys+0x20c/0x2b8\n  |   __access_remote_vm+0x46c/0x5b8\n  |   access_remote_vm+0x18/0x30\n  |   environ_read+0x238/0x3e8\n  |   vfs_read+0xe4/0x2b0\n  |   ksys_read+0xcc/0x178\n  |   __arm64_sys_read+0x4c/0x68\n\nExtract only the memory type from the user 'pgprot_t' in ioremap_prot()\nand assert that we're being passed a user mapping, to protect us against\nany changes in future that may require additional handling. To avoid\nfalsely flagging users of ioremap(), provide our own ioremap() macro\nwhich simply wraps __ioremap_prot().","modified":"2026-08-30T05:26:50Z","published":"2026-03-25T11:16:32Z","upstream":["CVE-2026-23346"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23346"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.143.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-80627.json"}}],"schema_version":"1.9.0"}