A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. This could allow a malicious user to overwrite local variables allocated on the stack. Specifically, the `out_sg` variable could be used to read a part of process memory and send it to the wire, causing an information leak.
Workaround:
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
The product writes data past the end, or before the beginning, of the intended buffer.
| Link | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2024:2962 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2025:4492 | vendor advisory |
| https://access.redhat.com/security/cve/CVE-2023-6693 | third party advisory vdb entry |
| https://bugzilla.redhat.com/show_bug.cgi?id=2254580 | patch issue tracking |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/ | |
| https://security.netapp.com/advisory/ntap-20240208-0004/ |