Description
In the Linux kernel, the following vulnerability has been resolved: mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op() 'op-cs' is copied in 'fun->mchip_number' which is used to access the 'mchip_offsets' and the 'rnb_gpio' arrays. These arrays have NAND_MAX_CHIPS elements, so the index must be below this limit. Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This would lead to out-of-bound accesses.
References5
- git.kernel.org/stable/c/1f09d67d390647f83f8f9d26382b0daa43756e6f
- git.kernel.org/stable/c/49e57caf967a969f6b955c88805f2d160910aa12
- git.kernel.org/stable/c/c6abce60338aa2080973cd95be0aedad528bb41f
- git.kernel.org/stable/c/eb7a5e4d14c8659cb97db6863316280e15f67209
- git.kernel.org/stable/c/f4b700c71802c81e6f9dce362ee7a0312c8377ba
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 6 · as of 11 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.