CVE-2025-38677f2fs: fix to avoid out-of-boundary access in dnode page
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data().
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Linux Linux linux:linux (from the name) | from 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 before ee4d13f5407cbdf1216cc258f45492075713889a; from 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 before a650654365c57407413e9b1f6ff4d539bf2e99ca; 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 builds before 6b7784ea07e6aa044f74b39d6b5af5e28746fc81; from 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 before 901f62efd6e855f93d8b1175540f29f4dc45ba55; 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 builds before 92ef491b506a0f4dd971a3a76f86f2d8f5370180; from 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 before 888aa660144bcb6ec07839da756ee46bfcf7fc53; from 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 before f1d5093d9fe9f3c74c123741c88666cc853b79c5; 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 builds before 77de19b6867f2740cdcb6c9c7e50d522b47847a4 | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.8 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4 | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889apatch
- https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99capatch
- https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81patch
- https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55patch
- https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180patch
- https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53patch
- https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5patch
- https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.