CVE-2024-46794

x86/tdx: Fix data leak in mmio_read()

EPSS 0.2%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

18 Sep 2024Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

In the Linux kernel, the following vulnerability has been resolved: x86/tdx: Fix data leak in mmio_read() The mmio_read() function makes a TDVMCALL to retrieve MMIO data for an address from the VMM. Sean noticed that mmio_read() unintentionally exposes the value of an initialized variable (val) on the stack to the VMM. This variable is only needed as an output value. It did not need to be passed to the VMM in the first place. Do not send the original value of *val to the VMM. [ dhansen: clarify what 'val' is used for. ]

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/26c6af49d26ffc377e392e30d4086db19eed0ef7 https://git.kernel.org/stable/c/b55ce742afcb8e8189d82f2f1e635ba1b5a461fa https://git.kernel.org/stable/c/b6fb565a2d15277896583d471b21bc14a0c99661 https://git.kernel.org/stable/c/ef00818c50cf55a3a56bd9a9fae867c92dfb84e7 https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html