CVE-2026-72155 | BDVDB-2026-359609 Detail
LinuxLinux
Description#
In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: swp: Improve locking user experience In the case of the first block being locked (or the few first blocks), if the user want to fully unlock the device it has two possibilities: - either it asks to unlock the entire device, and this works; - or it asks to unlock just the block(s) that are currently locked, which fails. It fails because the conditions "can_be_top" and "can_be_bottom" are true. Indeed, in this case, we unlock everything, so the TB bit does not matter. However in the current implementation, use_top would be true (as this is the favourite option) and lock_len, which in practice should be reduced down to 0, is set to "nor->params->size - (ofs + len)" which is a positive number. This is wrong. An easy way is to simply add an extra condition. In the unlock() path, if we can achieve the same result from both sides, it means we unlock everything and lock_len must simply be 0. A comment is added to clarify that logic.
Impact#
No impact statement in the source data.
Weaknesses#
No weakness recorded in the source data.
References#
- https://git.kernel.org/stable/c/23c285be8f6fcde9088fe12bb69c701d46696be1
- https://git.kernel.org/stable/c/a6fd2145c73b80bb6a5eed7355a4f63597d712d9
- https://git.kernel.org/stable/c/9a0d8dec3d11ca95d67537ea8fa6ee2730a5038a
- https://git.kernel.org/stable/c/dc341272cf8e15a2c511db3c4df5dab8adf70ad0
- https://git.kernel.org/stable/c/6110ab5ffd84e8daa654652446a03ce2f77580a7
- https://git.kernel.org/stable/c/c0806df5cf806545160f3fdac3c888926ceac557
- https://git.kernel.org/stable/c/12d4d69221159e6d0e72400ec81195d691169b53
- https://git.kernel.org/stable/c/e1d456b26bf23e30db305a6184e8abd9ab68bbf2
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.