vhost/vdpa: reject VRING_NUM larger than device max
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.158, 6.12.111, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: vhost/vdpa: reject VRING_NUM larger than device max vhost_vring_set_num() accepts any non-zero power-of-two queue size that fits in 16 bits. vhost-vdpa then passes that value to set_vq_num() without comparing it with get_vq_num_max(). A process with access to /dev/vhost-vdpa-* can therefore configure a queue larger than the device advertises. With vdpa_sim, the worker can walk descriptors beyond the mapped descriptor ring. KASAN reports a 16-byte out-of-bounds read, corresponding to one vring_desc, in the vringh IOTLB path: BUG: KASAN: out-of-bounds in _copy_from_iter Read of size 16 copy_from_iotlb copydesc_iotlb vringh_getdesc_iotlb vdpasim_net_work Cache get_vq_num_max() immediately after reset. Some backends derive it from writable queue-size state, so querying it after SET_NUM may return the current size instead of the device capability. Invalidate the cached value before reset so a failed reset leaves SET_NUM disabled. For VHOST_SET_VRING_NUM, copy the complete vring state once and use the same index and size for validation, vq->num, and set_vq_num(). This ensures that validation and use operate on the same copied values.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 4c8cf31885f69e86be0b5b9e6677a26797365e1d · fixed in 4875c65ca53797a0a402fe2bb54d1b12f28b3cda; From 4c8cf31885f69e86be0b5b9e6677a26797365e1d · fixed in 1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4; From 4c8cf31885f69e86be0b5b9e6677a26797365e1d · fixed in 68232102f20fc961327fb9e0f605a7eaadf030a9; From 4c8cf31885f69e86be0b5b9e6677a26797365e1d · fixed in 59522639a7d71cff4e20d594d0b9ea30dd0c77e0; From 4c8cf31885f69e86be0b5b9e6677a26797365e1d · fixed in ccb1dc7c527f8c925925cf92afc76ae590dac311
- Linux Linux
5.7
- KernelLinux
From 5.7.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7