{"id":"CVE-2022-50869","state":"PUBLISHED","title":"fs/ntfs3: Fix slab-out-of-bounds in r_page","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Fix slab-out-of-bounds in r_page\n\nWhen PAGE_SIZE is 64K, if read_log_page is called by log_read_rst for\nthe first time, the size of *buffer would be equal to\nDefaultLogPageSize(4K).But for *buffer operations like memcpy,\nif the memory area size(n) which being assigned to buffer is larger\nthan 4K (log->page_size(64K) or bytes(64K-page_off)), it will cause\nan out of boundary error.\n Call trace:\n  [...]\n  kasan_report+0x44/0x130\n  check_memory_region+0xf8/0x1a0\n  memcpy+0xc8/0x100\n  ntfs_read_run_nb+0x20c/0x460\n  read_log_page+0xd0/0x1f4\n  log_read_rst+0x110/0x75c\n  log_replay+0x1e8/0x4aa0\n  ntfs_loadlog_and_replay+0x290/0x2d0\n  ntfs_fill_super+0x508/0xec0\n  get_tree_bdev+0x1fc/0x34c\n  [...]\n\nFix this by setting variable r_page to NULL in log_read_rst.","publishedAt":"2025-12-30T12:15:39.879Z","updatedAt":"2026-08-05T08:59:54.196Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"ed686e7a26dd19ae6b46bb662f735acfa88ff7bc","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"bf86a640a34947d92062996e1a75b9cd9d83dd19","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"6d076293e5bffdf897ea5f975669206e09beed6a","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"ecfbd57cf9c5ca225184ae266ce44ae473792132","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.87","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.17","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.3","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"]}],"references":["https://git.kernel.org/stable/c/ed686e7a26dd19ae6b46bb662f735acfa88ff7bc","https://git.kernel.org/stable/c/bf86a640a34947d92062996e1a75b9cd9d83dd19","https://git.kernel.org/stable/c/6d076293e5bffdf897ea5f975669206e09beed6a","https://git.kernel.org/stable/c/ecfbd57cf9c5ca225184ae266ce44ae473792132"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50869.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50869","state":"PUBLISHED","datePublished":"2025-12-30T12:15:39.879Z","dateUpdated":"2026-08-05T08:59:54.196Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-30T12:06:07.136Z"},"containers":{"cna":{"title":"fs/ntfs3: Fix slab-out-of-bounds in r_page","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Fix slab-out-of-bounds in r_page\n\nWhen PAGE_SIZE is 64K, if read_log_page is called by log_read_rst for\nthe first time, the size of *buffer would be equal to\nDefaultLogPageSize(4K).But for *buffer operations like memcpy,\nif the memory area size(n) which being assigned to buffer is larger\nthan 4K (log->page_size(64K) or bytes(64K-page_off)), it will cause\nan out of boundary error.\n Call trace:\n  [...]\n  kasan_report+0x44/0x130\n  check_memory_region+0xf8/0x1a0\n  memcpy+0xc8/0x100\n  ntfs_read_run_nb+0x20c/0x460\n  read_log_page+0xd0/0x1f4\n  log_read_rst+0x110/0x75c\n  log_replay+0x1e8/0x4aa0\n  ntfs_loadlog_and_replay+0x290/0x2d0\n  ntfs_fill_super+0x508/0xec0\n  get_tree_bdev+0x1fc/0x34c\n  [...]\n\nFix this by setting variable r_page to NULL in log_read_rst."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"ed686e7a26dd19ae6b46bb662f735acfa88ff7bc","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"bf86a640a34947d92062996e1a75b9cd9d83dd19","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"6d076293e5bffdf897ea5f975669206e09beed6a","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","status":"affected","lessThan":"ecfbd57cf9c5ca225184ae266ce44ae473792132","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.87","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.17","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.3","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ed686e7a26dd19ae6b46bb662f735acfa88ff7bc"},{"url":"https://git.kernel.org/stable/c/bf86a640a34947d92062996e1a75b9cd9d83dd19"},{"url":"https://git.kernel.org/stable/c/6d076293e5bffdf897ea5f975669206e09beed6a"},{"url":"https://git.kernel.org/stable/c/ecfbd57cf9c5ca225184ae266ce44ae473792132"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only by presenting a crafted NTFS volume to the in-kernel ntfs3 driver so mount runs ntfs_fill_super→ntfs_loadlog_and_replay→log_replay→log_read_rst→read _log_page; this is a local block-device/loop/USB image path with no network protocol handler.\nAC:L - On 16K/64K PAGE_SIZE kernels log->page_size exceeds the fixed 4K r_page allocation so the first read_log_page deterministically overflows; on 4K kernels a crafted on-disk sys_page_size < 4096 takes the realloc path and overflows the same way, with no race or uncontrollable layout dependency.\nPR:N - The attacker needs no account on the target—the payload is solely a malicious NTFS image (USB stick, disk image, or media handed to udisks2/automount on desktops, kiosks, Android, or automotive systems), matching other ntfs3 image-parsing scores.\nUI:R - Someone must mount the volume or insert the media into a system that automounts it; ntfs3 is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so an unprivileged userns cannot mount it alone.\nS:U - The slab out-of-bounds write corrupts host kernel heap within the same security authority as the mounting kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - ntfs_read_run_nb memcpy's up to tens of KiB of attacker-controlled $LogFile bytes past a 4K slab object into adjacent heap, enabling classic heap-overlap disclosure primitives consistent with memory-corruption guidance.\nI:H - This is a large attacker-controlled slab out-of-bounds write (disk contents into undersized r_page), providing a heap write primitive suitable for adjacent-object corruption and control-flow hijack.\nA:H - The commit's KASAN stack shows a slab-out-of-bounds fault in ntfs_read_run_nb during mount that oopses/panics the kernel, fully denying availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:59:54.196Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.87"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.0.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}