In the Linux kernel, the following vulnerability has been resolved:
hwrng: virtio - Fix race on data_avail and actual data
The virtio rng device kicks off a new entropy request whenever the
data available reaches zero. When a new request occurs at the end
of a read operation, that is, when the result of that request is
only needed by the next reader, then there is a race between the
writing of the new data and the next reader.
This is because there is no synchronisation whatsoever between the
writer and the reader.
Fix this by writing data_avail with smp_store_release and reading
it with smp_load_acquire when we first enter read. The subsequent
reads are safe because they're either protected by the first load
acquire, or by the completion mechanism.
Also remove the redundant zeroing of data_idx in random_recv_done
(data_idx must already be zero at this point) and data_avail in
request_entropy (ditto).
from f7f510ec195781c857ab76366a3e1c59e1caae42 before 241ef15776a7c8505008db689175b320d345ecd3; from f7f510ec195781c857ab76366a3e1c59e1caae42 before a43bcb0b661cbbf3ad797d2aee6b6fd06b8fc69d; from f7f510ec195781c857ab76366a3e1c59e1caae42 before 77471e4912d3960dafe141e268c44be8024fe4dc; from f7f510ec195781c857ab76366a3e1c59e1caae42 before c76d991b6f01a5d931e7053a73bc9524975a5215; from f7f510ec195781c857ab76366a3e1c59e1caae42 before 22c30022cde6e2c88612b3a499223cfa912f1bc7; from f7f510ec195781c857ab76366a3e1c59e1caae42 before 318657b4c2077289659f1cd9e2a34f6a3b208e3e; from f7f510ec195781c857ab76366a3e1c59e1caae42 before 2fc91f156b3f3446a1bce80cf4adedcbf41271c2; from f7f510ec195781c857ab76366a3e1c59e1caae42 before ac52578d6e8d300dd50f790f29a24169b1edd26c
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.
Printed from infosecsignals.com. Every record links back to the agency that published it.
Your cookie choices
We use essential cookies to run this site, and, only with your consent, an advertising cookie from Google to measure whether our ads lead to sign-ups and subscriptions. See our for details.
