Description
In the Linux kernel, the following vulnerability has been resolved: vdpa_sim_blk: reject out-of-range sector starts vdpasim_blk_check_range() logs an invalid start sector but continues validating the request. The subsequent unsigned capacity subtraction can underflow and let an out-of-range buffer offset reach the data path. The invalid offset is used by three request paths. VIRTIO_BLK_T_OUT copies guest data to blk->buffer + offset through vringh_iov_pull_iotlb(), causing an out-of-bounds write in _copy_from_iter() or memcpy(). VIRTIO_BLK_T_IN copies from blk->buffer + offset to the guest through vringh_iov_push_iotlb(), causing an out-of-bounds read in _copy_to_iter(). VIRTIO_BLK_T_WRITE_ZEROES passes blk->buffer + offset to memset(), causing an out-of-bounds write. Reject starts at or beyond the capacity before the subtraction. Treat the capacity boundary as invalid because the IN and OUT paths round byte counts down to sectors for validation but later copy the original byte counts. A sub-sector request at the capacity boundary would otherwise still access past the end of the buffer. I found this bug myself, though the patch was written with AI assistance.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
7d189f617f83f780915b737896a696ff605bd19f to < 2ff2a8d063fdfa1e1479fb1fe2e3356a2ce89018affected7d189f617f83f780915b737896a696ff605bd19f to < 36ef4d8527f71648f00347f6ba759f0b7e5e0977affected7d189f617f83f780915b737896a696ff605bd19f to < 000c6300776ceaf6b715780113f4275b1be4195baffected7d189f617f83f780915b737896a696ff605bd19f to < 14acb0d44b7d90a077beb7b92b444b90bafda9d9affected7d189f617f83f780915b737896a696ff605bd19f to < a8a1413a2cfdbedc896249f461d6d92efbbfe21faffected7d189f617f83f780915b737896a696ff605bd19f to < d6dac17e20fd2abd0eb8c09d69fccf7426e12bcfaffected7d189f617f83f780915b737896a696ff605bd19f to < 0a8693f00c408d85f086ad85d29e7030bf1e2055affected
Linux Linux
Default version status: affected
5.13affected0 to < 5.13unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2ff2a8d063fdfa1e1479fb1fe2e3356a2ce89018 ↗
- https://git.kernel.org/stable/c/36ef4d8527f71648f00347f6ba759f0b7e5e0977 ↗
- https://git.kernel.org/stable/c/000c6300776ceaf6b715780113f4275b1be4195b ↗
- https://git.kernel.org/stable/c/14acb0d44b7d90a077beb7b92b444b90bafda9d9 ↗
- https://git.kernel.org/stable/c/a8a1413a2cfdbedc896249f461d6d92efbbfe21f ↗
- https://git.kernel.org/stable/c/d6dac17e20fd2abd0eb8c09d69fccf7426e12bcf ↗
- https://git.kernel.org/stable/c/0a8693f00c408d85f086ad85d29e7030bf1e2055 ↗