CVE-2019-19602
kernel: cached use of fpu_fpregs_owner_ctx in arch/x86/include/asm/fpu/internal.h can lead to DoS
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
2Exploited in Wild
-Decision
Descriptions
fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact because of incorrect fpu_fpregs_owner_ctx caching, as demonstrated by mishandling of signal-based non-cooperative preemption in Go 1.14 prereleases on amd64, aka CID-59c4bd853abc.
La función fpregs_state_valid en el archivo arch/x86/include/asm/fpu/internal.h en el kernel de Linux versiones anteriores a 5.4.2, cuando es usado GCC versión 9, permite a atacantes dependiendo del contexto causar una denegación de servicio (corrupción de memoria) o posiblemente tener otros impactos no especificados debido a un almacenamiento en caché incorrecto de fpu_fpregs_owner_ctx, como es demostrado por el manejo inapropiado de la preferencia no cooperativa basada en señal en Go versiones 1.14 preliminares a amd64, también se conoce como CID-59c4 anywhere53abc.
A flaw was found in the Linux kernel. When compiled with GCC 9, a vector register corruption occurs on return from a signal handler where the top page of the signal stack had not yet been paged in which can allow a local attacker with special user privilege (or root) to leak kernel internal information. The highest threat from this vulnerability is to data confidentiality.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2019-12-05 CVE Reserved
- 2019-12-05 CVE Published
- 2024-08-05 CVE Updated
- 2024-08-05 First Exploit
- 2024-12-17 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-672: Operation on a Resource after Expiration or Release
CAPEC
References (9)
| URL | Tag | Source |
|---|---|---|
| https://bugzilla.kernel.org/show_bug.cgi?id=205663 | Issue Tracking | |
| https://github.com/golang/go/issues/35777#issuecomment-561935388 | Issue Tracking | |
| https://security.netapp.com/advisory/ntap-20200103-0001 | Third Party Advisory |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 | 2020-08-24 | |
| https://usn.ubuntu.com/4284-1 | 2020-08-24 | |
| https://access.redhat.com/security/cve/CVE-2019-19602 | 2020-11-04 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1784572 | 2020-11-04 |
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" | < 5.4.2 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.2" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04" | lts |
Affected
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| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10" | - |
Affected
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