Description
In the Linux kernel, the following vulnerability has been resolved: vdpa_sim_net: check TX pull result before RX copy vringh_iov_pull_iotlb() returns a signed byte count. A failed TX pull is currently added to the unsigned byte counter and then passed as a size_t length to receive_filter() and vringh_iov_push_iotlb(). A negative error can therefore become a large length in the RX path. Handle non-positive pull results before every length use. Count the TX error and complete the consumed TX descriptor with zero bytes. I found this bug myself, though the patch was written with AI assistance.
References5
- git.kernel.org/stable/c/0d195797a80b77f2ec56718cd26d3ee65d0093e8
- git.kernel.org/stable/c/1b803d382cde6d85755b363f22010208a04ba40a
- git.kernel.org/stable/c/2bbf1c1f69991e28787e02b0a2f826289d5fc730
- git.kernel.org/stable/c/3af20238a09ca180d66623e3bed16b64e9975f39
- git.kernel.org/stable/c/c001abcde865b74231da8f1412c3217dbf66781e
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:H - EPSS — exploit probability
- 0% percentile: 2 · as of 9 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.