Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5212e11fde4d40fa627668b4f2222d20db488f71 before eb491343d2d1784121ad9af91c25b338c28913c3; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before f6c5313aae794ecca8f762c1a3493de5c266f120; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before f9bf05c63b77d000e9c01f3e47af36973887d350; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before 6f79d1a5f2611a3d36e9312be5425cd9cb397c51; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before 6b1faf1f099f7060b5f1f2f0d024132581f1726e; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before 9dfa11cef4750b67591307f2c62e47a23d60e4b7; affected 5212e11fde4d40fa627668b4f2222d20db488f71 before 6a1f2e5ed9267ca19187038ac635393c165213ac |
| Linux / Linux | affected 4.2; unaffected 0 before 4.2; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3
- https://git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7
- https://git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120
- https://git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350
- https://git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51
- https://git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e
- https://git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7
- https://git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac