Description

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: Fix potential buffer overflow in parse_ivrs_acpihid

There is a string parsing logic error which can lead to an overflow of hid
or uid buffers. Comparing ACPIID_LEN against a total string length doesn't
take into account the lengths of individual hid and uid buffers so the
check is insufficient in some cases. For example if the length of hid
string is 4 and the length of the uid string is 260, the length of str
will be equal to ACPIID_LEN + 1 but uid string will overflow uid buffer
which size is 256.

The same applies to the hid string with length 13 and uid string with
length 250.

Check the length of hid and uid strings separately to prevent
buffer overflow.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Classification

CVE ID: CVE-2025-37927

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.08% (probability of being exploited)

EPSS Percentile: 24.52% (scored less or equal to compared to others)

EPSS Date: 2025-06-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-37927
https://git.kernel.org/stable/c/466d9da267079a8d3b69fa72dfa3a732e1f6dbb5
https://git.kernel.org/stable/c/c3f37faa71f5d26dd2144b3f2b14525ec8f5e41f
https://git.kernel.org/stable/c/13d67528e1ae4486e9ab24b70122fab104c73c29
https://git.kernel.org/stable/c/10d901a95f8e766e5aa0bb9a983fb41271f64718
https://git.kernel.org/stable/c/c8bdfc0297965bb13fa439d36ca9c4f7c8447f0f
https://git.kernel.org/stable/c/8dee308e4c01dea48fc104d37f92d5b58c50b96c

Timeline