CVE-2025-23150

Advisory lineage Upstream: 0 Downstream: 59
Analyzed
Published: 01 May 2025, 12:55
Last modified:23 May 2026, 15:58

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.06% LOW
0% probability +0.04%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 May 2025, 12:55
Published
Vulnerability first disclosed
23 May 2026, 15:58
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix off-by-one error in do_split Syzkaller detected a use-after-free issue in ext4_insert_dentry that was caused by out-of-bounds access due to incorrect splitting in do_split. BUG: KASAN: use-after-free in ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109 Write of size 251 at addr ffff888074572f14 by task syz-executor335/5847 CPU: 0 UID: 0 PID: 5847 Comm: syz-executor335 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109 add_dirent_to_buf+0x3d9/0x750 fs/ext4/namei.c:2154 make_indexed_dir+0xf98/0x1600 fs/ext4/namei.c:2351 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2455 ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2796 ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3431 vfs_symlink+0x137/0x2e0 fs/namei.c:4615 do_symlinkat+0x222/0x3a0 fs/namei.c:4641 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> The following loop is located right above 'if' statement. for (i = count-1; i >= 0; i--) { /* is more than half of this entry in 2nd half of the block? */ if (size + map[i].size/2 > blocksize/2) break; size += map[i].size; move++; } 'i' in this case could go down to -1, in which case sum of active entries wouldn't exceed half the block size, but previous behaviour would also do split in half if sum would exceed at the very last block, which in case of having too many long name files in a single block could lead to out-of-bounds access and following use-after-free. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.06%• Percentile: 20%

Techniques & Countermeasures

  • CWE-193•Off-by-one Error

    A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ ea54176e5821936d109bb45dc2c19bd53559e735, < b96bd2c3db26ad0daec5b78c85c098b53900e2e1 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 515c34cff899eb5dae6aa7eee01c1295b07d81af | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 2883e9e74f73f9265e5f8d1aaaa89034b308e433 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 35d0aa6db9d93307085871ceab8a729594a98162 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 2eeb1085bf7bd5c7ba796ca4119925fa5d336a3f | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 16d9067f00e3a7d1df7c3aa9c20d214923d27e10 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 17df39f455f1289319d4d09e4826aa46852ffd17 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < ab0cc5c25552ae0d20eae94b40a93be11b080fc5 | ≥ 5872331b3d91820e14716632ebb56b1399b34fe1, < 94824ac9a8aaf2fb3c54b4bdde842db80ffa555d | 059b1480105478c5f68cf664301545b8cad6a7cf | 539ae3e03875dacaa9c388aff141ccbb4ef4ecb5 | fbbfd55a40d5d0806b59ee0403c75d5ac517533f | b3ddf6ba5e28a57729fff1605ae08e21be5c92e3 | e50fe43e3062e18846e99d9646b9c07b097eb1ed | 88e79f7a9841278fa8ff7ff6178bad12da002ffc | ≥ 5.4.61, < 5.4.293 | ≥ 4.4.234, < 4.5 | ≥ 4.9.234, < 4.10 | ≥ 4.14.195, < 4.15 | ≥ 4.19.142, < 4.20 | ≥ 5.7.18, < 5.8 | ≥ 5.8.4, < 5.9 | 5.9

  • linux•linux_kernel

    ≥ 4.4.234, < 4.5 | ≥ 4.9.234, < 4.10 | ≥ 4.14.195, < 4.15 | ≥ 4.19.142, < 4.20 | ≥ 5.4.61, < 5.4.293 | ≥ 5.7.18, < 5.8 | ≥ 5.8.4, < 5.9 | ≥ 5.9.1, < 5.10.237 | ≥ 5.11, < 5.15.181 | ≥ 5.16, < 6.1.135 | ≥ 6.2, < 6.6.88 | ≥ 6.7, < 6.12.24 | ≥ 6.13, < 6.13.12 | ≥ 6.14, < 6.14.3 | 5.9 | 5.9:rc2 | 5.9:rc3 | 5.9:rc4 | 5.9:rc5 | 5.9:rc6 | 5.9:rc7 | 5.9:rc8 | 6.15:rc1

References (11)