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CVE-2025-71123— ext4: fix string copying in parse_apply_sb_mount_options()

EPSS 0.02% · P5
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I. Basic Information for CVE-2025-71123

Vulnerability Information
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Vulnerability Title
ext4: fix string copying in parse_apply_sb_mount_options()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix string copying in parse_apply_sb_mount_options() strscpy_pad() can't be used to copy a non-NUL-term string into a NUL-term string of possibly bigger size. Commit 0efc5990bca5 ("string.h: Introduce memtostr() and memtostr_pad()") provides additional information in that regard. So if this happens, the following warning is observed: strnlen: detected buffer overflow: 65 byte read of buffer size 64 WARNING: CPU: 0 PID: 28655 at lib/string_helpers.c:1032 __fortify_report+0x96/0xc0 lib/string_helpers.c:1032 Modules linked in: CPU: 0 UID: 0 PID: 28655 Comm: syz-executor.3 Not tainted 6.12.54-syzkaller-00144-g5f0270f1ba00 #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__fortify_report+0x96/0xc0 lib/string_helpers.c:1032 Call Trace: <TASK> __fortify_panic+0x1f/0x30 lib/string_helpers.c:1039 strnlen include/linux/fortify-string.h:235 [inline] sized_strscpy include/linux/fortify-string.h:309 [inline] parse_apply_sb_mount_options fs/ext4/super.c:2504 [inline] __ext4_fill_super fs/ext4/super.c:5261 [inline] ext4_fill_super+0x3c35/0xad00 fs/ext4/super.c:5706 get_tree_bdev_flags+0x387/0x620 fs/super.c:1636 vfs_get_tree+0x93/0x380 fs/super.c:1814 do_new_mount fs/namespace.c:3553 [inline] path_mount+0x6ae/0x1f70 fs/namespace.c:3880 do_mount fs/namespace.c:3893 [inline] __do_sys_mount fs/namespace.c:4103 [inline] __se_sys_mount fs/namespace.c:4080 [inline] __x64_sys_mount+0x280/0x300 fs/namespace.c:4080 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x64/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e Since userspace is expected to provide s_mount_opts field to be at most 63 characters long with the ending byte being NUL-term, use a 64-byte buffer which matches the size of s_mount_opts, so that strscpy_pad() does its job properly. Return with error if the user still managed to provide a non-NUL-term string here. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于字符串复制函数使用不当，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux b2bac84fde28fb6a88817b8b761abda17a1d300b ~ 52ac96c4a2dd7bc47666000440b0602d9742e820 -
LinuxLinux 6.18 -

II. Public POCs for CVE-2025-71123

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III. Intelligence Information for CVE-2025-71123

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Same Patch Batch · Linux · 2026-01-14 · 43 CVEs total

CVE-2025-71112net: hns3: add VLAN id validation before using
CVE-2025-71122iommufd/selftest: Check for overflow in IOMMU_TEST_OP_ADD_RESERVED
CVE-2025-71108usb: typec: ucsi: Handle incorrect num_connectors capability
CVE-2025-71110mm/slub: reset KASAN tag in defer_free() before accessing freed memory
CVE-2025-71109MIPS: ftrace: Fix memory corruption when kernel is located beyond 32 bits
CVE-2025-71105f2fs: use global inline_xattr_slab instead of per-sb slab cache
CVE-2025-71104KVM: x86: Fix VM hard lockup after prolonged inactivity with periodic HV timer
CVE-2025-71103drm/msm: adreno: fix deferencing ifpc_reglist when not declared
CVE-2025-71102scs: fix a wrong parameter in __scs_magic
CVE-2025-71106fs: PM: Fix reverse check in filesystems_freeze_callback()
CVE-2025-71111hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
CVE-2025-71113crypto: af_alg - zero initialize memory allocated via sock_kmalloc
CVE-2025-71114via_wdt: fix critical boot hang due to unnamed resource allocation
CVE-2025-71115um: init cpu_tasks[] earlier
CVE-2025-71116libceph: make decode_pool() more resilient against corrupted osdmaps
CVE-2025-71117block: Remove queue freezing from several sysfs store callbacks
CVE-2025-71118ACPICA: Avoid walking the Namespace if start_node is NULL
CVE-2025-71120SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
CVE-2025-71119powerpc/kexec: Enable SMT before waking offline CPUs
CVE-2025-71121parisc: Do not reprogram affinitiy on ASP chip

Showing top 20 of 43 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71123

Anonymous User
2026-01-15 06:08:15

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