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CVE-2025-68237— mtdchar: fix integer overflow in read/write ioctls

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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mtdchar读写ioctl整数溢出，可能导致缓冲区溢出。

AI Predicted 7.8 Difficulty: Hard EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83< f37efdd97fd1ec3e0d0f1eec279c8279e28f981e affected
6420ac0af95dbcb2fd8452e2d551ab50e1bbad83< 457376c6fbf0c69326a9bf1f72416225f681192b affected
6420ac0af95dbcb2fd8452e2d551ab50e1bbad83< eb9361484814fb12f3b7544b33835ea67d7a6a97 affected
6420ac0af95dbcb2fd8452e2d551ab50e1bbad83< 37944f4f8199cd153fef74e95ca268020162f212 affected
6420ac0af95dbcb2fd8452e2d551ab50e1bbad83< e4185bed738da755b191aa3f2e16e8b48450e1b8 affected
5.17 affected
< 5.17 unaffected
6.1.159≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-68237

Vulnerability Information
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Vulnerability Title
mtdchar: fix integer overflow in read/write ioctls
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mtdchar: fix integer overflow in read/write ioctls The "req.start" and "req.len" variables are u64 values that come from the user at the start of the function. We mask away the high 32 bits of "req.len" so that's capped at U32_MAX but the "req.start" variable can go up to U64_MAX which means that the addition can still integer overflow. Use check_add_overflow() to fix this bug.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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mtdchar读写ioctl整数溢出，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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ~ f37efdd97fd1ec3e0d0f1eec279c8279e28f981e -
Linux Linux 5.17 -

II. Public POCs for CVE-2025-68237

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III. Intelligence Information for CVE-2025-68237

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Other References for CVE-2025-68237 (5)

Same Patch Batch · Linux · 2025-12-16 · 156 CVEs total

CVE-2025-68285 9.8 CRITICAL libceph: fix potential use-after-free in have_mon_and_osd_map()
CVE-2025-40350 9.8 CRITICAL net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ
CVE-2025-68263 9.8 CRITICAL ksmbd: ipc: fix use-after-free in ipc_msg_send_request
CVE-2025-68192 9.8 CRITICAL net: usb: qmi_wwan: initialize MAC header offset in qmimux_rx_fixup
CVE-2025-68301 9.8 CRITICAL net: atlantic: fix fragment overflow handling in RX path
CVE-2025-68284 9.8 CRITICAL libceph: prevent potential out-of-bounds writes in handle_auth_session_key()
CVE-2025-68315 9.8 CRITICAL f2fs: fix to detect potential corrupted nid in free_nid_list
CVE-2025-68255 8.8 HIGH staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing
CVE-2025-68226 8.8 HIGH smb: client: fix incomplete backport in cfids_invalidation_worker()
CVE-2025-68256 8.8 HIGH staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser
CVE-2025-68314 8.8 HIGH drm/msm: make sure last_fence is always updated
CVE-2025-40362 8.8 HIGH ceph: fix multifs mds auth caps issue
CVE-2025-68304 8.8 HIGH Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
CVE-2025-68250 8.2 HIGH hung_task: fix warnings caused by unaligned lock pointers
CVE-2025-68181 7.8 HIGH drm/radeon: Remove calls to drm_put_dev()
CVE-2025-68179 7.8 HIGH s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
CVE-2025-68175 7.8 HIGH media: nxp: imx8-isi: Fix streaming cleanup on release
CVE-2025-68207 7.8 HIGH drm/xe/guc: Synchronize Dead CT worker with unbind
CVE-2025-68265 7.8 HIGH nvme: fix admin request_queue lifetime
CVE-2025-68208 7.8 HIGH bpf: account for current allocated stack depth in widen_imprecise_scalars()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68237

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