CVE-2025-21818
x86/xen: fix xen_hypercall_hvm() to not clobber %rbx
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved: x86/xen: fix xen_hypercall_hvm() to not clobber %rbx xen_hypercall_hvm(), which is used when running as a Xen PVH guest at
most only once during early boot, is clobbering %rbx. Depending on
whether the caller relies on %rbx to be preserved across the call or
not, this clobbering might result in an early crash of the system. This can be avoided by using an already saved register instead of %rbx.
In the Linux kernel, the following vulnerability has been resolved: x86/xen: fix xen_hypercall_hvm() to not clobber %rbx xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved across the call or not, this clobbering might result in an early crash of the system. This can be avoided by using an already saved register instead of %rbx.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2024-12-29 CVE Reserved
- 2025-02-27 CVE Published
- 2025-02-27 CVE Updated
- ---------- EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/7e44e7065263c3baf287e7ff267a610cccde7544 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/31f29270c15bef700cbea40297c6b9a7114b3960 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/3fbfac0f30441725e87d85d8629fa9dbc673704b | Vuln. Introduced | |
| https://git.kernel.org/stable/c/b4845bb6383821a9516ce30af3a27dc873e37fd4 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/76b42b1340ca0c17961a1000474a23eff6f15f83 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/a501b4dbedb4cdcfa2372b40e6b405e26d3e8069 | Vuln. Introduced |
| URL | Date | SRC |
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| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.1.121 < 6.1.129 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1.121 < 6.1.129" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.6.67 < 6.6.78 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6.67 < 6.6.78" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.12.6 < 6.12.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.12.6 < 6.12.14" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.13 < 6.13.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.13 < 6.13.3" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.13 < 6.14-rc2 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.13 < 6.14-rc2" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.10.232 Search vendor "Linux" for product "Linux Kernel" and version "5.10.232" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.15.175 Search vendor "Linux" for product "Linux Kernel" and version "5.15.175" | en |
Affected
| ||||||