What’s Vulnerable › Vulnerabilities

CVE-2019-19602

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-05 · updated 2026-06-17
• Weakness: CWE-119

Description

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.

Affected products

• Canonical Ubuntu Linux: 18.04, 19.10
• Linux kernel: before 5.4.2 — fixed in 5.4.2

How to fix

Upgrade to a fixed version: Linux kernel 5.4.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.kernel.org/show_bug.cgi?id=205663
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
• https://github.com/golang/go/issues/35777#issuecomment-561935388
• https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
• https://security.netapp.com/advisory/ntap-20200103-0001/
• https://usn.ubuntu.com/4284-1/
• https://bugzilla.kernel.org/show_bug.cgi?id=205663
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
• https://github.com/golang/go/issues/35777#issuecomment-561935388
• https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98

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