CVE-2025-68237mtdchar: fix integer overflow in read/write ioctls
- —Not scoredno CVSS score yet
- 0.19%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.19% · top 92% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 – < f37efdd97fd1ec3e0d0f1eec279c8279e28f981e
- affected 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 – < 457376c6fbf0c69326a9bf1f72416225f681192b
- affected 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 – < eb9361484814fb12f3b7544b33835ea67d7a6a97
- affected 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 – < 37944f4f8199cd153fef74e95ca268020162f212
- affected 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 – < e4185bed738da755b191aa3f2e16e8b48450e1b8
- affected 5.17
- unaffected < 5.17
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.118 – ≤ 6.6.*
- unaffected 6.12.60 – ≤ 6.12.*
- unaffected 6.17.10 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References5
- https://git.kernel.org/stable/c/f37efdd97fd1ec3e0d0f1eec279c8279e28f981e (opens in a new tab)
- https://git.kernel.org/stable/c/457376c6fbf0c69326a9bf1f72416225f681192b (opens in a new tab)
- https://git.kernel.org/stable/c/eb9361484814fb12f3b7544b33835ea67d7a6a97 (opens in a new tab)
- https://git.kernel.org/stable/c/37944f4f8199cd153fef74e95ca268020162f212 (opens in a new tab)
- https://git.kernel.org/stable/c/e4185bed738da755b191aa3f2e16e8b48450e1b8 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-203659 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-68237)Record last updated .