CVE-2026-46190 mtd: spi-nor: debugfs: fix out-of-bounds read in spi_nor_params_show()
An out-of-bounds read in the Linux kernel's SPI NOR debugfs interface allows local attackers to disclose sensitive memory contents.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46190?
CVE-2026-46190 is a high-severity vulnerability in Linux kernel, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mtd: spi-nor: debugfs: fix out-of-bounds read in spi_nor_params_show()
Sashiko noticed an out-of-bounds read [1].
In spi_nor_params_show(), the snor_f_names array is passed to spi_nor_print_flags() using sizeof(snor_f_names).
Since snor_f_names is an array of pointers, sizeof() returns the total number of bytes occupied by the pointers (element_count * sizeof(void *)) rather than the element count itself. On 64-bit systems, this makes the passed length 8x larger than intended.
Inside spi_nor_print_flags(), the 'names_len' argument is used to bounds-check the 'names' array access. An out-of-bounds read occurs if a flag bit is set that exceeds the array's actual element count but is within the inflated byte-size count.
Correct this by using ARRAY_SIZE() to pass the actual number of string pointers in the array.
Weakness: CWE-125
Which versions are affected by CVE-2026-46190?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46190?
Apply the vendor's patch.
Is CVE-2026-46190 being exploited?
There is no known exploitation of CVE-2026-46190 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88863, BELL-CVE-2026-46190, DEBIAN-CVE-2026-46190, GHSA-v954-p6j3-5m22, ROOT-OS-DEBIAN-12-CVE-2026-46190, ROOT-OS-UBUNTU-2404-CVE-2026-46190 and 1 more.