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kernel: when setting font with malicious data by ioctl PIO_FONT, kernel will write memory out of bounds

🗓️ 16 May 2023 08:43:55Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 11 Views

Local user can crash or escalate privileges via malicious font data, causing out-of-bounds writes in the kernel.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.8x86_64kernel-rt4.18.0-477.10.1.rt7.274.el8_8kernel-rt-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-core4.18.0-477.10.1.rt7.274.el8_8kernel-rt-core-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-core4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-core-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-debuginfo4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-debuginfo-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-devel4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-devel-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-kvm4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-kvm-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-modules4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-modules-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debug-modules-extra4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debug-modules-extra-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8x86_64kernel-rt-debuginfo4.18.0-477.10.1.rt7.274.el8_8kernel-rt-debuginfo-4.18.0-477.10.1.rt7.274.el8_8.x86_64.rpm
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07 Aug 2026 19:24Current
6.6Medium risk
Vulners AI Score6.6
CVSS 3.16.8
EPSS0.00573
11