CVE-2025-23150

Katalog CVE

CVSS 5.5 · Medium EPSS 0,23%

Kerentanan Off-by-one Error pada linux kernel, debian linux. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

1 Mei 2025

Terakhir diubah

30 Juli 2026

Status NVD

Modified

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-193: Off-by-one Error

EPSS (30 hari)

0,23% peluang dieksploitasi; lebih tinggi dari 13,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/16d9067f00e3a7d1df7c3aa9c20d214923d27e10 patch
• https://git.kernel.org/stable/c/17df39f455f1289319d4d09e4826aa46852ffd17 patch
• https://git.kernel.org/stable/c/2883e9e74f73f9265e5f8d1aaaa89034b308e433 patch
• https://git.kernel.org/stable/c/2eeb1085bf7bd5c7ba796ca4119925fa5d336a3f patch
• https://git.kernel.org/stable/c/35d0aa6db9d93307085871ceab8a729594a98162 patch
• https://git.kernel.org/stable/c/515c34cff899eb5dae6aa7eee01c1295b07d81af patch
• https://git.kernel.org/stable/c/94824ac9a8aaf2fb3c54b4bdde842db80ffa555d patch
• https://git.kernel.org/stable/c/ab0cc5c25552ae0d20eae94b40a93be11b080fc5 patch
• https://git.kernel.org/stable/c/b96bd2c3db26ad0daec5b78c85c098b53900e2e1 patch
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html mailing list
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html mailing list