CVE-2026-97990

vdpa_sim_net: check TX pull result before RX copy

State: Published
Severity: 7.5 High
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	cfe226892913a448e83e7a19db93862baa3cb99c to before 1b803d382cde6d85755b363f22010208a04ba40aAffected cfe226892913a448e83e7a19db93862baa3cb99c to before c001abcde865b74231da8f1412c3217dbf66781eAffected cfe226892913a448e83e7a19db93862baa3cb99c to before 3af20238a09ca180d66623e3bed16b64e9975f39Affected cfe226892913a448e83e7a19db93862baa3cb99c to before 2bbf1c1f69991e28787e02b0a2f826289d5fc730Affected cfe226892913a448e83e7a19db93862baa3cb99c to before 0d195797a80b77f2ec56718cd26d3ee65d0093e8Affected
LinuxLinux	5.19Affected before 5.19Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

cfe226892913a448e83e7a19db93862baa3cb99c to before 1b803d382cde6d85755b363f22010208a04ba40aAffected
cfe226892913a448e83e7a19db93862baa3cb99c to before c001abcde865b74231da8f1412c3217dbf66781eAffected
cfe226892913a448e83e7a19db93862baa3cb99c to before 3af20238a09ca180d66623e3bed16b64e9975f39Affected
cfe226892913a448e83e7a19db93862baa3cb99c to before 2bbf1c1f69991e28787e02b0a2f826289d5fc730Affected
cfe226892913a448e83e7a19db93862baa3cb99c to before 0d195797a80b77f2ec56718cd26d3ee65d0093e8Affected

LinuxLinux

5.19Affected
before 5.19Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

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