CVE-2024-44941

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-44941", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T05:34:56.665Z", "datePublished": "2024-08-26T11:20:45.678Z", "dateUpdated": "2026-10-30T12:19:08.713Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:19:08.713Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to cover read extent cache access with lock\n\nsyzbot reports a f2fs bug as below:\n\nBUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\nRead of size 4 at addr ffff8880739ab220 by task syz-executor200/5097\n\nCPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\n do_read_inode fs/f2fs/inode.c:509 [inline]\n f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560\n f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237\n generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413\n exportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444\n exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584\n do_handle_to_path fs/fhandle.c:155 [inline]\n handle_to_path fs/fhandle.c:210 [inline]\n do_handle_open+0x495/0x650 fs/fhandle.c:226\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nWe missed to cover sanity_check_extent_cache() w/ extent cache lock,\nso, below race case may happen, result in use after free issue.\n\n- f2fs_iget\n - do_read_inode\n - f2fs_init_read_extent_tree\n : add largest extent entry in to cache\n\t\t\t\t\t- shrink\n\t\t\t\t\t - f2fs_shrink_read_extent_tree\n\t\t\t\t\t - __shrink_extent_tree\n\t\t\t\t\t - __detach_extent_node\n\t\t\t\t\t : drop largest extent entry\n - sanity_check_extent_cache\n : access et->largest w/o lock\n\nlet's refactor sanity_check_extent_cache() to avoid extent cache access\nand call it before f2fs_init_read_extent_tree() to fix this issue."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached through ordinary VFS syscalls (`open`/`stat`/`open_by_handle_at`) that instantiate an f2fs inode via `f2fs_iget()`->`do_read_inode()`, requiring a local account with access to a mounted f2fs filesystem. There is no remote or adjacent-network protocol handler on the path.\nAC:L - The attacker controls both sides of the race: they force the shrinker side by inflating extent-cache memory past the `f2fs_available_free_memory(READ_EXTENT_CACHE)` watermark so `f2fs_balance_fs_bg()`/`f2fs_shrink_scan()` run `f2fs_shrink_read_extent_tree()` continuously, and drive the iget side by repeatedly evicting and re-instantiating inodes. syzbot reproduced it in default configuration (`READ_EXTENT_CACHE` is set by `default_options()`).\nPR:L - No capability, owner, or privilege check exists anywhere on the `f2fs_lookup`/`f2fs_iget`/`do_read_inode`/`sanity_check_extent_cache ` path \u2014 any unprivileged user who can look up a file on an f2fs mount reaches it (e.g. any app on Android's f2fs `/data`).\nUI:N - The attacker performs the entire sequence with their own file operations and memory pressure against an already-mounted filesystem; no victim action is required.\nS:U - The corruption and its consequences are confined to the kernel's own memory and the local system's security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a slab-use-after-free read of a freed `extent_tree`; the attacker can groom the freed slot with controlled data, and the leaked `largest` extent is then installed as the inode's read-extent mapping, redirecting file reads to arbitrary data blocks and disclosing other files' contents, while the `f2fs_warn` also prints freed heap contents to the log.\nI:H - Beyond the read, the `CP_ERROR_FLAG` branch writes into the freed object (`ei->len = 0; et->largest_updated = true;`), giving a write primitive into a reallocated slab object, and the poisoned extent mapping causes subsequent I/O to be directed at attacker-influenced block addresses \u2014 a UAF of this shape is leverageable for control-flow hijack.\nA:H - The confirmed KASAN slab-use-after-free crashes the kernel, and the garbage `largest.blk` additionally drives `f2fs_is_valid_blkaddr()` failure paths (`f2fs_handle_error`, `SBI_NEED_FSCK`, `dump_stack`) that panic the system under `errors=panic`/`CONFIG_F2FS_CHECK_FS`, and can be retriggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "versions": [{"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "9bd5d5e3244242e7be26e86025b74eff3cf20d8c", "status": "affected", "versionType": "git"}, {"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "263df78166d3a9609b97d28c34029bd01874cbb8", "status": "affected", "versionType": "git"}, {"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "323ef20b5558b9d9fd10c1224327af6f11a8177d", "status": "affected", "versionType": "git"}, {"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "d7409b05a64f212735f0d33f5f1602051a886eab", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "versions": [{"version": "3.8", "status": "affected"}, {"version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.47", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.6", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.47"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.10.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9bd5d5e3244242e7be26e86025b74eff3cf20d8c"}, {"url": "https://git.kernel.org/stable/c/263df78166d3a9609b97d28c34029bd01874cbb8"}, {"url": "https://git.kernel.org/stable/c/323ef20b5558b9d9fd10c1224327af6f11a8177d"}, {"url": "https://git.kernel.org/stable/c/d7409b05a64f212735f0d33f5f1602051a886eab"}], "title": "f2fs: fix to cover read extent cache access with lock", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-44941", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:27:29.159607Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:04.422Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-44941", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:27:29.159607Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:13.936Z"}}], "cna": {"title": "f2fs: fix to cover read extent cache access with lock", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached through ordinary VFS syscalls (`open`/`stat`/`open_by_handle_at`) that instantiate an f2fs inode via `f2fs_iget()`->`do_read_inode()`, requiring a local account with access to a mounted f2fs filesystem. There is no remote or adjacent-network protocol handler on the path.\nAC:L - The attacker controls both sides of the race: they force the shrinker side by inflating extent-cache memory past the `f2fs_available_free_memory(READ_EXTENT_CACHE)` watermark so `f2fs_balance_fs_bg()`/`f2fs_shrink_scan()` run `f2fs_shrink_read_extent_tree()` continuously, and drive the iget side by repeatedly evicting and re-instantiating inodes. syzbot reproduced it in default configuration (`READ_EXTENT_CACHE` is set by `default_options()`).\nPR:L - No capability, owner, or privilege check exists anywhere on the `f2fs_lookup`/`f2fs_iget`/`do_read_inode`/`sanity_check_extent_cache ` path \u2014 any unprivileged user who can look up a file on an f2fs mount reaches it (e.g. any app on Android's f2fs `/data`).\nUI:N - The attacker performs the entire sequence with their own file operations and memory pressure against an already-mounted filesystem; no victim action is required.\nS:U - The corruption and its consequences are confined to the kernel's own memory and the local system's security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a slab-use-after-free read of a freed `extent_tree`; the attacker can groom the freed slot with controlled data, and the leaked `largest` extent is then installed as the inode's read-extent mapping, redirecting file reads to arbitrary data blocks and disclosing other files' contents, while the `f2fs_warn` also prints freed heap contents to the log.\nI:H - Beyond the read, the `CP_ERROR_FLAG` branch writes into the freed object (`ei->len = 0; et->largest_updated = true;`), giving a write primitive into a reallocated slab object, and the poisoned extent mapping causes subsequent I/O to be directed at attacker-influenced block addresses \u2014 a UAF of this shape is leverageable for control-flow hijack.\nA:H - The confirmed KASAN slab-use-after-free crashes the kernel, and the garbage `largest.blk` additionally drives `f2fs_is_valid_blkaddr()` failure paths (`f2fs_handle_error`, `SBI_NEED_FSCK`, `dump_stack`) that panic the system under `errors=panic`/`CONFIG_F2FS_CHECK_FS`, and can be retriggered at will."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "9bd5d5e3244242e7be26e86025b74eff3cf20d8c", "versionType": "git"}, {"status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "263df78166d3a9609b97d28c34029bd01874cbb8", "versionType": "git"}, {"status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "323ef20b5558b9d9fd10c1224327af6f11a8177d", "versionType": "git"}, {"status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "d7409b05a64f212735f0d33f5f1602051a886eab", "versionType": "git"}], "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"status": "unaffected", "version": "0", "lessThan": "3.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.47", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.6", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9bd5d5e3244242e7be26e86025b74eff3cf20d8c"}, {"url": "https://git.kernel.org/stable/c/263df78166d3a9609b97d28c34029bd01874cbb8"}, {"url": "https://git.kernel.org/stable/c/323ef20b5558b9d9fd10c1224327af6f11a8177d"}, {"url": "https://git.kernel.org/stable/c/d7409b05a64f212735f0d33f5f1602051a886eab"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to cover read extent cache access with lock\n\nsyzbot reports a f2fs bug as below:\n\nBUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\nRead of size 4 at addr ffff8880739ab220 by task syz-executor200/5097\n\nCPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\n do_read_inode fs/f2fs/inode.c:509 [inline]\n f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560\n f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237\n generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413\n exportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444\n exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584\n do_handle_to_path fs/fhandle.c:155 [inline]\n handle_to_path fs/fhandle.c:210 [inline]\n do_handle_open+0x495/0x650 fs/fhandle.c:226\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nWe missed to cover sanity_check_extent_cache() w/ extent cache lock,\nso, below race case may happen, result in use after free issue.\n\n- f2fs_iget\n - do_read_inode\n - f2fs_init_read_extent_tree\n : add largest extent entry in to cache\n\t\t\t\t\t- shrink\n\t\t\t\t\t - f2fs_shrink_read_extent_tree\n\t\t\t\t\t - __shrink_extent_tree\n\t\t\t\t\t - __detach_extent_node\n\t\t\t\t\t : drop largest extent entry\n - sanity_check_extent_cache\n : access et->largest w/o lock\n\nlet's refactor sanity_check_extent_cache() to avoid extent cache access\nand call it before f2fs_init_read_extent_tree() to fix this issue."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "3.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.47", "versionStartIncluding": "3.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.6", "versionStartIncluding": "3.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "3.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:19:08.713Z"}}}, "cveMetadata": {"cveId": "CVE-2024-44941", "state": "PUBLISHED", "dateUpdated": "2026-10-30T12:19:08.713Z", "dateReserved": "2024-08-21T05:34:56.665Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-26T11:20:45.678Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9bd5d5e3244242e7be26e86025b74eff3cf20d8c", "status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "versionType": "git"}, {"lessThan": "263df78166d3a9609b97d28c34029bd01874cbb8", "status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "versionType": "git"}, {"lessThan": "323ef20b5558b9d9fd10c1224327af6f11a8177d", "status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "versionType": "git"}, {"lessThan": "d7409b05a64f212735f0d33f5f1602051a886eab", "status": "affected", "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/f2fs/extent_cache.c", "fs/f2fs/f2fs.h", "fs/f2fs/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"lessThan": "3.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.47", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "76359420-35F9-49E4-B8EE-F18196698CB9", "versionEndExcluding": "6.2", "versionStartIncluding": "6.1.83", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2CFB1C9A-CF45-4F68-A176-BC7A4619DDBB", "versionEndExcluding": "6.6.47", "versionStartIncluding": "6.6.23", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CD8383BB-B294-4F4D-996D-A780685E6362", "versionEndExcluding": "6.8", "versionStartIncluding": "6.7.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "989C5A3D-9D85-422E-B3FD-F059A9F8FF51", "versionEndExcluding": "6.10.6", "versionStartIncluding": "6.8.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to cover read extent cache access with lock\n\nsyzbot reports a f2fs bug as below:\n\nBUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\nRead of size 4 at addr ffff8880739ab220 by task syz-executor200/5097\n\nCPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\n do_read_inode fs/f2fs/inode.c:509 [inline]\n f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560\n f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237\n generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413\n exportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444\n exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584\n do_handle_to_path fs/fhandle.c:155 [inline]\n handle_to_path fs/fhandle.c:210 [inline]\n do_handle_open+0x495/0x650 fs/fhandle.c:226\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nWe missed to cover sanity_check_extent_cache() w/ extent cache lock,\nso, below race case may happen, result in use after free issue.\n\n- f2fs_iget\n - do_read_inode\n - f2fs_init_read_extent_tree\n : add largest extent entry in to cache\n\t\t\t\t\t- shrink\n\t\t\t\t\t - f2fs_shrink_read_extent_tree\n\t\t\t\t\t - __shrink_extent_tree\n\t\t\t\t\t - __detach_extent_node\n\t\t\t\t\t : drop largest extent entry\n - sanity_check_extent_cache\n : access et->largest w/o lock\n\nlet's refactor sanity_check_extent_cache() to avoid extent cache access\nand call it before f2fs_init_read_extent_tree() to fix this issue."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: f2fs: correcci\u00f3n para cubrir el acceso a la cach\u00e9 de extensi\u00f3n de lectura con bloqueo syzbot informa un error de f2fs como se muestra a continuaci\u00f3n: ERROR: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/ f2fs/extent_cache.c:46 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff8880739ab220 por tarea syz-executor200/5097 CPU: 0 PID: 5097 Comm: syz-executor200 No contaminado 6.9.0-rc6-syzkaller #0 Nombre de hardware: Google Google Compute Engine /Google Compute Engine, BIOS Google 27/03/2024 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c: 377 [en l\u00ednea] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46 do_read_inode fs/f2fs /inode.c:509 [en l\u00ednea] f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560 f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237 generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413 exportar fs_decode_fh_raw +0x152/0x5f0 fs/exportfs/expfs.c:444 exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584 do_handle_to_path fs/fhandle.c:155 [en l\u00ednea] handle_to_path fs/fhandle.c:210 [en l\u00ednea] do_handle_open +0x495/0x650 fs/fhandle.c:226 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x77/0x7f Nos perdimos cubra sanity_check_extent_cache() con bloqueo de cach\u00e9 de extensi\u00f3n, por lo que, puede ocurrir el siguiente caso de ejecuci\u00f3n, lo que resultar\u00e1 en un problema de use after free. - f2fs_iget - do_read_inode - f2fs_init_read_extent_tree: agrega la entrada de mayor extensi\u00f3n al cach\u00e9 - encogimiento - f2fs_shrink_read_extent_tree - __shrink_extent_tree - __detach_extent_node: elimina la entrada de mayor extensi\u00f3n - sanity_check_extent_cache: accede a et-&gt;largest sin bloqueo, refactoricemos sanity_check_extent_cache() para evitar el cach\u00e9 de extensi\u00f3n acceso y ll\u00e1melo antes de f2fs_init_read_extent_tree() para solucionar este problema."}], "id": "CVE-2024-44941", "lastModified": "2026-10-30T13:17:34.327", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-44941", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:27:29.159607Z", "version": "2.0.3"}}]}, "published": "2024-08-26T12:15:06.107", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/263df78166d3a9609b97d28c34029bd01874cbb8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/323ef20b5558b9d9fd10c1224327af6f11a8177d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9bd5d5e3244242e7be26e86025b74eff3cf20d8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7409b05a64f212735f0d33f5f1602051a886eab"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: fix to cover read extent cache access with lock", "id": "2307900", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2307900"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix to cover read extent cache access with lock\nsyzbot reports a f2fs bug as below:\nBUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\nRead of size 4 at addr ffff8880739ab220 by task syz-executor200/5097\nCPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\nprint_address_description mm/kasan/report.c:377 [inline]\nprint_report+0x169/0x550 mm/kasan/report.c:488\nkasan_report+0x143/0x180 mm/kasan/report.c:601\nsanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46\ndo_read_inode fs/f2fs/inode.c:509 [inline]\nf2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560\nf2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237\ngeneric_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413\nexportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444\nexportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584\ndo_handle_to_path fs/fhandle.c:155 [inline]\nhandle_to_path fs/fhandle.c:210 [inline]\ndo_handle_open+0x495/0x650 fs/fhandle.c:226\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nWe missed to cover sanity_check_extent_cache() w/ extent cache lock,\nso, below race case may happen, result in use after free issue.\n- f2fs_iget\n- do_read_inode\n- f2fs_init_read_extent_tree\n: add largest extent entry in to cache\n- shrink\n- f2fs_shrink_read_extent_tree\n- __shrink_extent_tree\n- __detach_extent_node\n: drop largest extent entry\n- sanity_check_extent_cache\n: access et->largest w/o lock\nlet's refactor sanity_check_extent_cache() to avoid extent cache access\nand call it before f2fs_init_read_extent_tree() to fix this issue."], "name": "CVE-2024-44941", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44941\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44941\nhttps://lore.kernel.org/linux-cve-announce/2024082620-CVE-2024-44941-143e@gregkh/T"], "threat_severity": "Important"}

{}