{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38164", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.991Z", "datePublished": "2025-07-03T08:36:05.017Z", "dateUpdated": "2026-08-05T11:59:57.616Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:57.616Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: zone: fix to avoid inconsistence in between SIT and SSA\n\nw/ below testcase, it will cause inconsistence in between SIT and SSA.\n\ncreate_null_blk 512 2 1024 1024\nmkfs.f2fs -m /dev/nullb0\nmount /dev/nullb0 /mnt/f2fs/\ntouch /mnt/f2fs/file\nf2fs_io pinfile set /mnt/f2fs/file\nfallocate -l 4GiB /mnt/f2fs/file\n\nF2FS-fs (nullb0): Inconsistent segment (0) type [1, 0] in SSA and SIT\nCPU: 5 UID: 0 PID: 2398 Comm: fallocate Tainted: G O 6.13.0-rc1 #84\nTainted: [O]=OOT_MODULE\nHardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006\nCall Trace:\n \n dump_stack_lvl+0xb3/0xd0\n dump_stack+0x14/0x20\n f2fs_handle_critical_error+0x18c/0x220 [f2fs]\n f2fs_stop_checkpoint+0x38/0x50 [f2fs]\n do_garbage_collect+0x674/0x6e0 [f2fs]\n f2fs_gc_range+0x12b/0x230 [f2fs]\n f2fs_allocate_pinning_section+0x5c/0x150 [f2fs]\n f2fs_expand_inode_data+0x1cc/0x3c0 [f2fs]\n f2fs_fallocate+0x3c3/0x410 [f2fs]\n vfs_fallocate+0x15f/0x4b0\n __x64_sys_fallocate+0x4a/0x80\n x64_sys_call+0x15e8/0x1b80\n do_syscall_64+0x68/0x130\n entry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f9dba5197ca\nF2FS-fs (nullb0): Stopped filesystem due to reason: 4\n\nThe reason is f2fs_gc_range() may try to migrate block in curseg, however,\nits SSA block is not uptodate due to the last summary block data is still\nin cache of curseg.\n\nIn this patch, we add a condition in f2fs_gc_range() to check whether\nsection is opened or not, and skip block migration for opened section." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The trigger is entirely local — an `ioctl(F2FS_IOC_SET_PIN_FILE)` followed by a `fallocate(2)` syscall on a file the attacker created on a mounted f2fs volume. No network or adjacent-network reachability exists.\nAC:L - The reproducer is deterministic and single-threaded: touch, pin, fallocate 4GiB immediately shuts the filesystem down, with no race to win and no memory-layout dependency. On the affected configuration (f2fs on a zoned device, as shipped on Android zUFS and SMR/ZNS storage) every attempt succeeds.\nPR:L - `f2fs_ioc_set_pin_file()` performs no capability check whatsoever — only regular-file and write-access checks — and `f2fs_fallocate()` is unprivileged, so any local user or sandboxed app with write access to a directory on the f2fs mount (e.g. Android `/data`) can reach `f2fs_allocate_pinning_section()`.\nUI:N - The attacker performs every step itself; no victim action is required beyond the filesystem already being mounted, which is normal system state.\nS:U - The vulnerability and its impact are both confined to the kernel/filesystem security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - There is no read primitive — the stale-summary entries are rejected by `is_alive()`'s blkaddr comparison and `__set_test_and_free()` prevents a cursec from being re-handed out, so no memory or cross-file data is disclosed.\nI:H - The bug drives GC to migrate blocks in a section a log is actively writing, producing the SIT/SSA inconsistency the fix is named for, setting `SBI_NEED_FSCK` and recording `STOP_CP_REASON_CORRUPTED_SUMMARY` in the superblock so the volume requires repair; the forced checkpoint stop also discards other users' uncheckpointed data on the shared filesystem, a consequence the unprivileged attacker inflicts system-wide.\nA:H - `f2fs_handle_critical_error()` either panics the kernel outright under `errors=panic`, or sets `CP_ERROR_FLAG` so the entire filesystem returns `-EIO` for all subsequent operations until unmount and fsck — on a device whose `/data` or root volume is zoned f2fs this is a complete, unprivileged denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/gc.c" ], "versions": [ { "version": "40d76c393cca83938b11eb7ca8983aa3cd0ed69b", "lessThan": "d1365d2abfaf2d85ee51a005da3ca373aea97f6a", "status": "affected", "versionType": "git" }, { "version": "9703d69d9d153bb230711d0d577454552aeb13d4", "lessThan": "44a51592ac657d8e422585414d7ec17a5b50fb0e", "status": "affected", "versionType": "git" }, { "version": "9703d69d9d153bb230711d0d577454552aeb13d4", "lessThan": "8d9431b0d11a5030aa1ce477defee455b3821701", "status": "affected", "versionType": "git" }, { "version": "9703d69d9d153bb230711d0d577454552aeb13d4", "lessThan": "773704c1ef96a8b70d0d186ab725f50548de82c4", "status": "affected", "versionType": "git" }, { "version": "6.6.33", "lessThan": "6.6.130", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/gc.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "6.6.33", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d1365d2abfaf2d85ee51a005da3ca373aea97f6a" }, { "url": "https://git.kernel.org/stable/c/44a51592ac657d8e422585414d7ec17a5b50fb0e" }, { "url": "https://git.kernel.org/stable/c/8d9431b0d11a5030aa1ce477defee455b3821701" }, { "url": "https://git.kernel.org/stable/c/773704c1ef96a8b70d0d186ab725f50548de82c4" } ], "title": "f2fs: zone: fix to avoid inconsistence in between SIT and SSA", "x_generator": { "engine": "bippy-1.2.0" } } } }