CVE-2021-47055High· 7.1▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: mtd: require write permissions for locking and badblock ioctls MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require write permission. Depending on the h…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
0.2% → 0.2%
In the Linux kernel, the following vulnerability has been resolved:
mtd: require write permissions for locking and badblock ioctls
MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require write permission. Depending on the hardware MEMLOCK might even be write-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK is always write-once.
MEMSETBADBLOCK modifies the bad block table.
linux_kernel >= 4.4.233, < 4.4.269linux_kernel >= 4.9.233, < 4.9.269linux_kernel >= 4.14.194, < 4.14.233linux_kernel >= 4.19.139, < 4.19.191linux_kernel >= 5.4.58, < 5.4.119linux_kernel >= 5.9, < 5.10.37linux_kernel >= 5.11, < 5.11.21linux_kernel >= 5.12, < 5.12.4Upgrade past the affected range:
linux_kernel 5.12.4Connected by shared product, vendor, weakness, or advisory.
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