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

x86/xen: don't do PV iret hypercall through hypercall page

Instead of jumping to the Xen hypercall page for doing the iret
hypercall, directly code the required sequence in xen-asm.S.

This is done in preparation of no longer using hypercall page at all,
as it has shown to cause problems with speculation mitigations.

This is part of XSA-466 / CVE-2024-53241.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-53241
• https://git.kernel.org/stable/c/05df6e6cd9a76b778aee33c3c18c9f3b3566d4a5
• https://git.kernel.org/stable/c/82c211ead1ec440dbf81727e17b03b5e3c44b93d
• https://git.kernel.org/stable/c/a2796dff62d6c6bfc5fbebdf2bee0d5ac0438906
• https://git.kernel.org/stable/c/c7b4cfa6213a44fa48714186dfdf125072d036e3
• https://git.kernel.org/stable/c/f7c3fdad0a474062d566aae3289d490d7e702d30
• https://git.kernel.org/stable/c/fa719857f613fed94a79da055b13ca51214c694f
• http://www.openwall.com/lists/oss-security/2024/12/17/2
• http://www.openwall.com/lists/oss-security/2024/12/23/1
• http://xenbits.xen.org/xsa/advisory-466.html
• http://www.openwall.com/lists/oss-security/2025/01/05/1
• http://www.openwall.com/lists/oss-security/2025/01/05/2