263 lines
15 KiB
JSON
263 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-56692",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-27T15:00:39.849Z",
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"datePublished": "2024-12-28T09:46:17.539Z",
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"dateUpdated": "2026-10-30T12:20:25.681Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:20:25.681Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on node blkaddr in truncate_node()\n\nsyzbot reports a f2fs bug as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2534!\nRIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534\nCall Trace:\n truncate_node+0x1ae/0x8c0 fs/f2fs/node.c:909\n f2fs_remove_inode_page+0x5c2/0x870 fs/f2fs/node.c:1288\n f2fs_evict_inode+0x879/0x15c0 fs/f2fs/inode.c:856\n evict+0x4e8/0x9b0 fs/inode.c:723\n f2fs_handle_failed_inode+0x271/0x2e0 fs/f2fs/inode.c:986\n f2fs_create+0x357/0x530 fs/f2fs/namei.c:394\n lookup_open fs/namei.c:3595 [inline]\n open_last_lookups fs/namei.c:3694 [inline]\n path_openat+0x1c03/0x3590 fs/namei.c:3930\n do_filp_open+0x235/0x490 fs/namei.c:3960\n do_sys_openat2+0x13e/0x1d0 fs/open.c:1415\n do_sys_open fs/open.c:1430 [inline]\n __do_sys_openat fs/open.c:1446 [inline]\n __se_sys_openat fs/open.c:1441 [inline]\n __x64_sys_openat+0x247/0x2a0 fs/open.c:1441\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534\n\nThe root cause is: on a fuzzed image, blkaddr in nat entry may be\ncorrupted, then it will cause system panic when using it in\nf2fs_invalidate_blocks(), to avoid this, let's add sanity check on\nnat blkaddr in truncate_node()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The attack requires a crafted f2fs image to be mounted on the local system and is then triggered through ordinary local filesystem syscalls (`openat`, `unlink`, `truncate`) reaching `truncate_node()`; no network protocol is involved.\nAC:L - The corrupted `block_addr` is a static, fully attacker-chosen field in the on-disk NAT journal that `remove_nats_in_journal()` copies into the NAT cache verbatim, so `truncate_node()` picks it up deterministically on every node truncation — no race, no timing window, and no dependence on memory layout the attacker cannot influence.\nPR:L - Once the malicious volume is mounted — automatically by udisks2 on desktops/kiosks or by vold for Android SD-card/adoptable storage, since f2fs is Android's primary filesystem — any unprivileged user with access to the mount triggers the path with a plain file create, unlink, or truncate; no capability check stands between that user and `truncate_node()`.\nUI:N - The attacker performs both halves of the attack: the volume is mounted automatically on media insertion by the automounter, and the trigger is the attacker's own ordinary file operation, requiring no action by any victim.\nS:U - The out-of-bounds accesses and the resulting corruption are confined to kernel memory of the same machine; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - `get_seg_entry()` indexes `sit_i->sentries[]` with an unbounded `segno` derived from the attacker's 32-bit blkaddr and performs no bounds check, so `update_segment_mtime()`/`update_sit_entry()` read `struct seg_entry` fields — including the `cur_valid_map`/`ckpt_valid_map`/`discard_map` pointers — from arbitrary kernel memory far outside the array.\nI:H - The same unbounded index produces out-of-bounds writes to `se->mtime`, `se->valid_blocks`, the `dirty_sentries_bitmap` bit set by `__mark_sit_entry_dirty()`, and `get_sec_entry()->valid_blocks`, plus a bit-clear performed through `se->cur_valid_map` — a pointer that was itself read out of bounds — giving a wild-pointer write primitive suitable for control-flow hijacking.\nA:H - The reported symptom is an outright kernel panic at `f2fs_bug_on(sbi, addr == NULL_ADDR)` in `f2fs_invalidate_blocks()` (`BUG_ON` under `CONFIG_F2FS_CHECK_FS`, `WARN_ON` elsewhere, fatal with `panic_on_warn`), and the out-of-bounds pointer dereferences oops the kernel independently."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/node.c"
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],
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"versions": [
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "a6d51de6bf729edc9fc7f87ffaae4e6bbda6329a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "27d6e7eff07f8cce8e83b162d8f21a07458c860d",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "c1077078ce4589b5e5387f6b0aaa0d4534b9eb57",
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"status": "affected",
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"status": "affected",
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "6babe00ccd34fc65b78ef8b99754e32b4385f23d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/node.c"
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],
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"versions": [
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{
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"version": "3.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.64",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.11",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.2",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "6.1.191"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a6d51de6bf729edc9fc7f87ffaae4e6bbda6329a"
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},
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{
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"url": "https://git.kernel.org/stable/c/27d6e7eff07f8cce8e83b162d8f21a07458c860d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c1077078ce4589b5e5387f6b0aaa0d4534b9eb57"
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},
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{
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"url": "https://git.kernel.org/stable/c/0a5c8b3fbf6200f1c66062d307c9a52084917788"
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{
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"url": "https://git.kernel.org/stable/c/6babe00ccd34fc65b78ef8b99754e32b4385f23d"
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}
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],
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"title": "f2fs: fix to do sanity check on node blkaddr in truncate_node()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-56692",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:59:11.953057Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-754",
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"description": "CWE-754 Improper Check for Unusual or Exceptional Conditions"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-10-01T20:07:08.292Z"
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}
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}
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]
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}
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} |