What happened
In the Linux kernel, the following vulnerability has been resolved: [ceph] parse_longname(): strrchr() expects NUL-terminated string ... and parse_longname() is not guaranteed that. That's the reason why it uses kmemdup_nul() to build the argument for kstrtou64(); the problem is, kstrtou64() is not the only thing that need it. Just get a NUL-terminated copy of the entire thing and be done with that...
Affected versions
Linux: dd66df0053ef84add5e684df517aa9b498342381 through before 4b9aee707c4580511983a0998547f3b28514e6a6 (git); dd66df0053ef84add5e684df517aa9b498342381 through before bb80f7618832d26f7e395f52f82b1dac76223e5f (git); dd66df0053ef84add5e684df517aa9b498342381 through before 3145b2b11492d61c512bbc59660bb823bc757f48 (git); dd66df0053ef84add5e684df517aa9b498342381 through before 493479af8af3ab907f49e99323777d498a4fbd2b (git); dd66df0053ef84add5e684df517aa9b498342381 through before 101841c38346f4ca41dc1802c867da990ffb32eb (git); 6.6 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.