{"id":"CVE-2024-26947","title":"ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses\n\nSince commit a4d5613c4dc6 (\"arm: extend pfn_valid to take into account\nfreed memory map ali…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < ed95b1e88174566de3dc81d94399aacf2c9dfba4","Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c027c2bad7f5111c51a358b5d392e1a695dabff","Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 9f7ddc222cae8254e93d5c169a8ae11a49d912a7","Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < fb3a122a978626b33de3367ee1762da934c0f512","Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c66c6f4e21cb22220cbd8821c5c73fc157d20dc","Linux 6026d4032dbbe3d7f4ac2c8daa923fe74dcf41c4","Linux 65c578935bcc26ddc04e6757b2c7be95bf235b31","Linux >= 5.4.167 < 5.5","Linux >= 5.10.87 < 5.11","Linux 5.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-06-17T17:40:49.744241Z"},"published":"2024-05-01","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:18:02.172Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-26947","references":[{"url":"https://git.kernel.org/stable/c/ed95b1e88174566de3dc81d94399aacf2c9dfba4"},{"url":"https://git.kernel.org/stable/c/0c027c2bad7f5111c51a358b5d392e1a695dabff"},{"url":"https://git.kernel.org/stable/c/9f7ddc222cae8254e93d5c169a8ae11a49d912a7"},{"url":"https://git.kernel.org/stable/c/fb3a122a978626b33de3367ee1762da934c0f512"},{"url":"https://git.kernel.org/stable/c/0c66c6f4e21cb22220cbd8821c5c73fc157d20dc"}],"tags":["cve.org"],"epss":0.0023,"epssPercentile":0.13832,"ingestedAt":"2026-11-03T12:44:28.802Z","slug":"CVE-2024-26947","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses\n\nSince commit a4d5613c4dc6 (\"arm: extend pfn_valid to take into account\nfreed memory map alignment\") changes the semantics of pfn_valid() to check\npresence of the memory map for a PFN. A valid page for an address which\nis reserved but not mapped by the kernel[1], the system crashed during\nsome uio test with the following memory layout:\n\n node   0: [mem 0x00000000c0a00000-0x00000000cc8fffff]\n node   0: [mem 0x00000000d0000000-0x00000000da1fffff]\n the uio layout is：0xc0900000, 0x100000\n\nthe crash backtrace like:\n\n  Unable to handle kernel paging request at virtual address bff00000\n  [...]\n  CPU: 1 PID: 465 Comm: startapp.bin Tainted: G           O      5.10.0 #1\n  Hardware name: Generic DT based system\n  PC is at b15_flush_kern_dcache_area+0x24/0x3c\n  LR is at __sync_icache_dcache+0x6c/0x98\n  [...]\n   (b15_flush_kern_dcache_area) from (__sync_icache_dcache+0x6c/0x98)\n   (__sync_icache_dcache) from (set_pte_at+0x28/0x54)\n   (set_pte_at) from (remap_pfn_range+0x1a0/0x274)\n   (remap_pfn_range) from (uio_mmap+0x184/0x1b8 [uio])\n   (uio_mmap [uio]) from (__mmap_region+0x264/0x5f4)\n   (__mmap_region) from (__do_mmap_mm+0x3ec/0x440)\n   (__do_mmap_mm) from (do_mmap+0x50/0x58)\n   (do_mmap) from (vm_mmap_pgoff+0xfc/0x188)\n   (vm_mmap_pgoff) from (ksys_mmap_pgoff+0xac/0xc4)\n   (ksys_mmap_pgoff) from (ret_fast_syscall+0x0/0x5c)\n  Code: e0801001 e2423001 e1c00003 f57ff04f (ee070f3e)\n  ---[ end trace 09cf0734c3805d52 ]---\n  Kernel panic - not syncing: Fatal exception\n\nSo check if PG_reserved was set to solve this issue.\n\n[1]: https://lore.kernel.org/lkml/Zbtdue57RO0QScJM@linux.ibm.com/\n\n## Affected\n\n- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < ed95b1e88174566de3dc81d94399aacf2c9dfba4`\n- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c027c2bad7f5111c51a358b5d392e1a695dabff`\n- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 9f7ddc222cae8254e93d5c169a8ae11a49d912a7`\n- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < fb3a122a978626b33de3367ee1762da934c0f512`\n- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c66c6f4e21cb22220cbd8821c5c73fc157d20dc`\n- `Linux 6026d4032dbbe3d7f4ac2c8daa923fe74dcf41c4`\n- `Linux 65c578935bcc26ddc04e6757b2c7be95bf235b31`\n- `Linux >= 5.4.167 < 5.5`\n- `Linux >= 5.10.87 < 5.11`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}