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kernel: mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c

🗓️ 22 Dec 2020 09:43:51Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 7 Views

Crafted ext4 image unmount causes use-after-free in ext4_put_super, enabling memory corruption.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux7.6x86_64bpftool0:3.10.0-957.65.1.el7bpftool-0:3.10.0-957.65.1.el7.x86_64.rpm
Red Hat Enterprise Linux7.6ppc64kernel0:3.10.0-957.65.1.el7kernel-0:3.10.0-957.65.1.el7.ppc64.rpm
Red Hat Enterprise Linux7.6ppc64lekernel0:3.10.0-957.65.1.el7kernel-0:3.10.0-957.65.1.el7.ppc64le.rpm
Red Hat Enterprise Linux7.6s390xkernel0:3.10.0-957.65.1.el7kernel-0:3.10.0-957.65.1.el7.s390x.rpm
Red Hat Enterprise Linux7.6x86_64kernel0:3.10.0-957.65.1.el7kernel-0:3.10.0-957.65.1.el7.x86_64.rpm
Red Hat Enterprise Linux7.6anykernel-abi-whitelists0:3.10.0-957.65.1.el7.noarchkernel-abi-whitelists-0:3.10.0-957.65.1.el7.noarch.noarch.rpm
Red Hat Enterprise Linux7.6ppc64kernel-bootwrapper0:3.10.0-957.65.1.el7kernel-bootwrapper-0:3.10.0-957.65.1.el7.ppc64.rpm
Red Hat Enterprise Linux7.6ppc64lekernel-bootwrapper0:3.10.0-957.65.1.el7kernel-bootwrapper-0:3.10.0-957.65.1.el7.ppc64le.rpm
Red Hat Enterprise Linux7.6ppc64kernel-debug0:3.10.0-957.65.1.el7kernel-debug-0:3.10.0-957.65.1.el7.ppc64.rpm
Red Hat Enterprise Linux7.6ppc64lekernel-debug0:3.10.0-957.65.1.el7kernel-debug-0:3.10.0-957.65.1.el7.ppc64le.rpm
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28 Jun 2026 09:06Current
6.8Medium risk
Vulners AI Score6.8
CVSS 26.8
CVSS 3.17.8
EPSS0.03539
CWE-416
crafted ext4 imageunmount procedureuse after freeext4 put supermemory corruption
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