Vulnerability 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.
References
- https://git.kernel.org/stable/c/12d4d69221159e6d0e72400ec81195d691169b53
- https://git.kernel.org/stable/c/23c285be8f6fcde9088fe12bb69c701d46696be1
- https://git.kernel.org/stable/c/6110ab5ffd84e8daa654652446a03ce2f77580a7
- https://git.kernel.org/stable/c/9a0d8dec3d11ca95d67537ea8fa6ee2730a5038a
- https://git.kernel.org/stable/c/a6fd2145c73b80bb6a5eed7355a4f63597d712d9
- https://git.kernel.org/stable/c/c0806df5cf806545160f3fdac3c888926ceac557
- https://git.kernel.org/stable/c/dc341272cf8e15a2c511db3c4df5dab8adf70ad0
- https://git.kernel.org/stable/c/e1d456b26bf23e30db305a6184e8abd9ab68bbf2
FAQ
What is CVE-2026-72155?
CVE-2026-72155 is a documented vulnerability. 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 u...
How severe is CVE-2026-72155?
CVSS scoring is not yet available for CVE-2026-72155. Check NVD for updates.
Is there a patch for CVE-2026-72155?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.