{"id":"CVE-2026-23346","state":"PUBLISHED","title":"arm64: io: Extract user memory type in ioremap_prot()","description":"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().","publishedAt":"2026-03-25T10:27:33.133Z","updatedAt":"2026-06-19T11:57:35.219Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"64858b76ec67c5fc40fef8ec1841fecb78c1ebde","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"eeecafce5afffb4da703666ebefbd4d6e2a5abf6","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"3d64dcc0799c2d6921ba027716b7be721eb19fa8","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"8f098037139b294050053123ab2bc0f819d08932","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/io.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/io.h"]}],"references":["https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde","https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6","https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8","https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a","https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23346.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23346","state":"PUBLISHED","datePublished":"2026-03-25T10:27:33.133Z","dateUpdated":"2026-06-19T11:57:35.219Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.999Z"},"containers":{"cna":{"title":"arm64: io: Extract user memory type in ioremap_prot()","descriptions":[{"lang":"en","value":"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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"64858b76ec67c5fc40fef8ec1841fecb78c1ebde","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"eeecafce5afffb4da703666ebefbd4d6e2a5abf6","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"3d64dcc0799c2d6921ba027716b7be721eb19fa8","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a","versionType":"git"},{"version":"893dea9ccd08dab924839354aba21d4ed7a9abc0","status":"affected","lessThan":"8f098037139b294050053123ab2bc0f819d08932","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/io.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/io.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde"},{"url":"https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6"},{"url":"https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8"},{"url":"https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"},{"url":"https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-19T11:57:35.219Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}