CVE-2026-97990

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcfe226892913a448e83e7a19db93862baa3cb99c < c001abcde865b74231da8f1412c3217dbf66781eaffected
LinuxLinuxcfe226892913a448e83e7a19db93862baa3cb99c < 3af20238a09ca180d66623e3bed16b64e9975f39affected
LinuxLinuxcfe226892913a448e83e7a19db93862baa3cb99c < 2bbf1c1f69991e28787e02b0a2f826289d5fc730affected
LinuxLinuxcfe226892913a448e83e7a19db93862baa3cb99c < 0d195797a80b77f2ec56718cd26d3ee65d0093e8affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References