{"id":"CVE-2024-26850","summary":"mm/debug_vm_pgtable: fix BUG_ON with pud advanced test","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/debug_vm_pgtable: fix BUG_ON with pud advanced test\n\nArchitectures like powerpc add debug checks to ensure we find only devmap\nPUD pte entries.  These debug checks are only done with CONFIG_DEBUG_VM. \nThis patch marks the ptes used for PUD advanced test devmap pte entries so\nthat we don't hit on debug checks on architecture like ppc64 as below.\n\nWARNING: CPU: 2 PID: 1 at arch/powerpc/mm/book3s64/radix_pgtable.c:1382 radix__pud_hugepage_update+0x38/0x138\n....\nNIP [c0000000000a7004] radix__pud_hugepage_update+0x38/0x138\nLR [c0000000000a77a8] radix__pudp_huge_get_and_clear+0x28/0x60\nCall Trace:\n[c000000004a2f950] [c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable)\n[c000000004a2f980] [000d34c100000000] 0xd34c100000000\n[c000000004a2f9a0] [c00000000206ba98] pud_advanced_tests+0x118/0x334\n[c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48\n[c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388\n\nAlso\n\n kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:202!\n ....\n\n NIP [c000000000096510] pudp_huge_get_and_clear_full+0x98/0x174\n LR [c00000000206bb34] pud_advanced_tests+0x1b4/0x334\n Call Trace:\n [c000000004a2f950] [000d34c100000000] 0xd34c100000000 (unreliable)\n [c000000004a2f9a0] [c00000000206bb34] pud_advanced_tests+0x1b4/0x334\n [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48\n [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388","modified":"2026-04-02T10:06:11.603562Z","published":"2024-04-17T10:14:20.812Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26850.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/720da1e593b85a550593b415bf1d79a053133451"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2a9510c0e39d06f5544075c13040407bdbf2803"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eeeddf85fc58d48c58ad916e4ca12363ebd8ab21"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26850.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26850"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"27af67f35631ac4b61b5e4455b44c9aee8d2cc4b"},{"fixed":"d2a9510c0e39d06f5544075c13040407bdbf2803"},{"fixed":"eeeddf85fc58d48c58ad916e4ca12363ebd8ab21"},{"fixed":"720da1e593b85a550593b415bf1d79a053133451"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26850.json"}}],"schema_version":"1.7.5"}