PT-2023-1383 · Linux+5 · Linux Kernel+5
Rafael Correa De Ysasi
+1
·
Published
2017-03-17
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Updated
2025-09-29
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CVE-2023-0045
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:C/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 4.9.176
Description
The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The
ib prctl set function updates the Thread Information Flags (TIFs) for the task and updates the SPEC CTRL MSR on the function speculation ctrl update, but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall.Recommendations
Upgrade past commit a664ec9158eeddd75121d39c9a0758016097fa96 to mitigate the issue. As a temporary workaround, consider disabling the
ib prctl set function until a patch is available. Restrict access to the vulnerable module to minimize the risk of exploitation. Avoid using the ib prctl set function in the affected API endpoint until the issue is resolved.Exploit
Fix
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Related Identifiers
Affected Products
Alt Linux
Astra Linux
Linuxmint
Linux Kernel
Suse
Ubuntu