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kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping

🗓️ 05 Nov 2019 20:44:12Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Kernel core dump race allows info leak and DoS due to missing locks around mmget_not_zero and get_task_mm.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8x86_64kernel-rt0:4.18.0-147.rt24.93.el8kernel-rt-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-core0:4.18.0-147.rt24.93.el8kernel-rt-core-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug0:4.18.0-147.rt24.93.el8kernel-rt-debug-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-core0:4.18.0-147.rt24.93.el8kernel-rt-debug-core-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-debuginfo0:4.18.0-147.rt24.93.el8kernel-rt-debug-debuginfo-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-devel0:4.18.0-147.rt24.93.el8kernel-rt-debug-devel-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-kvm0:4.18.0-147.rt24.93.el8kernel-rt-debug-kvm-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-kvm-debuginfo0:4.18.0-147.rt24.93.el8kernel-rt-debug-kvm-debuginfo-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-modules0:4.18.0-147.rt24.93.el8kernel-rt-debug-modules-0:4.18.0-147.rt24.93.el8.x86_64.rpm
Red Hat Enterprise Linux8x86_64kernel-rt-debug-modules-extra0:4.18.0-147.rt24.93.el8kernel-rt-debug-modules-extra-0:4.18.0-147.rt24.93.el8.x86_64.rpm
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28 Jun 2026 09:05Current
7.2High risk
Vulners AI Score7.2
CVSS 26.9
CVSS 3.17
EPSS0.00989
CWE-820
core dump racekernel vulnerabilitymissing lockinginformation leakdenial of servicememory management
4