CVE-2024-46794

x86/tdx: Fix data leak in mmio_read()

LOW

3.3

CVSS Score

Published: September 18, 2024 at 07:12 AM UTC

Updated: June 17, 2026 at 07:55 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

LOW3.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≤ 5.195.19 ≤ v < 6.1.1105.19 ≤ v < 6.10.105.19 ≤ v < 6.115.19 ≤ v < 6.6.516.1 ≤ v < 6.1.1106.10 ≤ v < 6.10.106.6 ≤ v < 6.6.5131d58c4e557d46fa7f8557714250fb6f89c941ae6.11 rc1 6.11 rc2 6.11 rc3 6.11 rc4 6.11 rc5 6.11 rc6

Vendor states this is fixed in 26c6af49d26ffc377e392e30d4086db19eed0ef7 (fixed)

Vendor states this is fixed in b55ce742afcb8e8189d82f2f1e635ba1b5a461fa (fixed)

Vendor states this is fixed in b6fb565a2d15277896583d471b21bc14a0c99661 (fixed)

Vendor states this is fixed in ef00818c50cf55a3a56bd9a9fae867c92dfb84e7 (fixed)

Vendor states this is fixed in 5.19 (unaffected)

Vendor states this is fixed in 6.1.110 (unaffected)

Vendor states this is fixed in 6.10.10 (unaffected)

Vendor states this is fixed in 6.11 (unaffected)

Vendor states this is fixed in 6.6.51 (unaffected)