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EUVD-2026-345842
European Vulnerability Database identifier assigned by ENISAReserved
2026-10-02 08:05
Assigner
ENISA
Alias of
a CVE record, shown under related vulnerabilities.
This identifier carries no description, severity or references of its own:
they belong to that CVE.
{
"assigner": "ENISA",
"date_reserved": "2026-10-02T08:05:17.264414+00:00",
"id": "EUVD-2026-345842"
}
CVE-2024-39467 (GCVE-0-2024-39467)
Vulnerability from cvelistv5 – Published: 2024-06-25 14:25 – Updated: 2026-08-05 11:33
VLAI
EPSS
VEX
Title
f2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()
Summary
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()
syzbot reports a kernel bug as below:
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
==================================================================
BUG: KASAN: slab-out-of-bounds in f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]
BUG: KASAN: slab-out-of-bounds in current_nat_addr fs/f2fs/node.h:213 [inline]
BUG: KASAN: slab-out-of-bounds in f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600
Read of size 1 at addr ffff88807a58c76c by task syz-executor280/5076
CPU: 1 PID: 5076 Comm: syz-executor280 Not tainted 6.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]
current_nat_addr fs/f2fs/node.h:213 [inline]
f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600
f2fs_xattr_fiemap fs/f2fs/data.c:1848 [inline]
f2fs_fiemap+0x55d/0x1ee0 fs/f2fs/data.c:1925
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:838
__do_sys_ioctl fs/ioctl.c:902 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:890
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The root cause is we missed to do sanity check on i_xattr_nid during
f2fs_iget(), so that in fiemap() path, current_nat_addr() will access
nat_bitmap w/ offset from invalid i_xattr_nid, result in triggering
kasan bug report, fix it.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-25 20:07 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < c559a8d840562fbfce9f318448dda2f7d3e6d8e8
(git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 75c87e2ac6149abf44bdde0dd6d541763ddb0dff (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 8c8aa473fe6eb46a4bf99f3ea2dbe52bf0c1a1f0 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < be0155202e431f3007778568a72432c68f8946ba (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 68e3cd4ecb8603936cccdc338929130045df2e57 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 20faaf30e55522bba2b56d9c46689233205d7717 (git) |
|
| Linux | Linux |
Affected:
3.8
Unaffected: 0 , < 3.8 (semver) Unaffected: 5.4.278 , ≤ 5.4.* (semver) Unaffected: 5.10.219 , ≤ 5.10.* (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.94 , ≤ 6.1.* (semver) Unaffected: 6.6.34 , ≤ 6.6.* (semver) Unaffected: 6.9.5 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()\n\nsyzbot reports a kernel bug as below:\n\nF2FS-fs (loop0): Mounted with checkpoint version = 48b305e4\n==================================================================\nBUG: KASAN: slab-out-of-bounds in f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]\nBUG: KASAN: slab-out-of-bounds in current_nat_addr fs/f2fs/node.h:213 [inline]\nBUG: KASAN: slab-out-of-bounds in f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600\nRead of size 1 at addr ffff88807a58c76c by task syz-executor280/5076\n\nCPU: 1 PID: 5076 Comm: syz-executor280 Not tainted 6.9.0-rc5-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n \u003cTASK\u003e\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 f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]\n current_nat_addr fs/f2fs/node.h:213 [inline]\n f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600\n f2fs_xattr_fiemap fs/f2fs/data.c:1848 [inline]\n f2fs_fiemap+0x55d/0x1ee0 fs/f2fs/data.c:1925\n ioctl_fiemap fs/ioctl.c:220 [inline]\n do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:838\n __do_sys_ioctl fs/ioctl.c:902 [inline]\n __se_sys_ioctl+0x81/0x170 fs/ioctl.c:890\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\nThe root cause is we missed to do sanity check on i_xattr_nid during\nf2fs_iget(), so that in fiemap() path, current_nat_addr() will access\nnat_bitmap w/ offset from invalid i_xattr_nid, result in triggering\nkasan bug report, fix it."
}
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"lang": "en",
"value": "AV:L - The vulnerable code is reached only through a locally attached/mounted crafted f2fs image, with the trigger being a local `ioctl(FS_IOC_FIEMAP, FIEMAP_FLAG_XATTR)` syscall or mount-time roll-forward recovery. No network or remote-peer data path exists into fs/f2fs/inode.c or the NAT lookup code.\nAC:L - The attacker fully controls every input \u2014 the on-disk `i_xattr_nid`, the checkpoint\u0027s NAT bitmap size, and the NAT/SSA/SIT block layout \u2014 so the out-of-range `NAT_BLOCK_OFFSET(nid)` deterministically indexes past `nm_i-\u003enat_bitmap` on the first attempt. There is no race, no dependence on uncontrollable memory layout, and no non-default kernel config (fiemap and roll-forward recovery are both default-enabled).\nPR:L - Once the image is mounted, any unprivileged user can trigger the out-of-bounds access with a plain `FS_IOC_FIEMAP` ioctl \u2014 there is no capability check anywhere on the path from `do_vfs_ioctl` through `f2fs_fiemap` to `current_nat_addr`. On Android (vold auto-mounts f2fs portable/adoptable storage) and desktop/kiosk systems (udisks2/polkit), an unprivileged console user gets the attacker\u0027s f2fs image mounted without root.\nUI:N - The attacker supplies their own crafted image and issues the fiemap ioctl themselves; removable-media auto-mount by udisks2/vold happens without any deliberate victim action. The recovery-path variant likewise fires automatically during the mount the attacker caused.\nS:U - The out-of-bounds read and the bit-flip write both stay inside the kernel\u0027s own address space and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab out-of-bounds read at an offset the attacker chooses byte-by-byte up to ~1.18 MB past a small `kmemdup`\u0027d `nat_bitmap`, so it is not a strictly bounded few-byte read. The bit read back selects which NAT block is parsed, and the resulting `ni.blk_addr` is returned to userspace as the fiemap extent\u0027s physical address, turning it into a repeatable oracle that discloses adjacent heap contents \u2014 kernel pointers and other slab objects \u2014 defeating KASLR.\nI:H - Via `f2fs_recover_xattr_data()` the bogus nid reaches `set_node_addr()`, which dirties a NAT set keyed on the out-of-range block offset; the next checkpoint then executes `f2fs_change_bit(block_off, nm_i-\u003enat_bitmap)` in `set_to_next_nat()` and `__set_bit_le(nat_index, nm_i-\u003eempty_nat_bits)` in `__update_nat_bits()` \u2014 out-of-bounds heap writes at an attacker-chosen offset. A controlled single-bit flip into a groomed adjacent slab object (pointer, refcount, or credential/permission field) is a well-established privilege-escalation primitive.\nA:H - The reported symptom is a KASAN slab-out-of-bounds report, which panics on `panic_on_warn`/hardened Android and cloud kernels; on non-KASAN kernels the read can walk into unmapped memory and oops. The out-of-bounds bit flips additionally corrupt the NAT bitmap and neighbouring heap objects, and `f2fs_bug_on`/`f2fs_handle_error` paths in the checkpoint flush stop the filesystem, so the crash is reliably re-triggerable."
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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