Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 84597a44a9d86ac949900441cea7da0af0f2f473 before 388c3f6496bb8083576d989e6d249ba9807c6b0b; affected 84597a44a9d86ac949900441cea7da0af0f2f473 before 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775; affected 84597a44a9d86ac949900441cea7da0af0f2f473 before 6228722c27304e4682cddc1fede03898f87e4414; affected 84597a44a9d86ac949900441cea7da0af0f2f473 before 68c5c42567bc462139128968ebbfadd0aefff519 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 6.12.114 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.