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kernel: mm: prevent derefencing NULL ptr in pfn_section_valid()

🗓️ 24 Sep 2024 00:40:51Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 11 Views

Fix NULL dereference in section validity by validating memory section usage after read-once to address race with section deactivate.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10x86_64kernel-rt4.18.0-553.22.1.rt7.363.el8_10kernel-rt-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-core4.18.0-553.22.1.rt7.363.el8_10kernel-rt-core-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-core4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-core-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-debuginfo4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-debuginfo-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-devel4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-devel-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-kvm4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-kvm-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-modules4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-modules-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debug-modules-extra4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debug-modules-extra-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64kernel-rt-debuginfo4.18.0-553.22.1.rt7.363.el8_10kernel-rt-debuginfo-4.18.0-553.22.1.rt7.363.el8_10.x86_64.rpm
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25 Aug 2026 14:47Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.15.5
EPSS0.00255
SSVC
CWE-476
null pointersection validityread oncememory section usagesection deactivate race
11