OESA-2022-1677

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OESA-2022-1677

Summary: kernel security update

Details: The Linux Kernel, the operating system core itself. Security Fix(es): A NULL pointer dereference flaw was found in the Linux kernel’s Amateur Radio AX.25 protocol functionality in the way a user connects with the protocol. This flaw allows a local user to crash the system.(CVE-2022-1205) UAF causes the system to crash Exploit conditions: The root user reduces the reference count of drm_vgem_gem_object through ioctl$DRM_IOCTL_MODE_DESTROY_DUMB, and vgem_gem_dumb_create will access the released drm_vgem_gem_object Technical reason: The gpu driver can reduce the reference count of drm_vgem_gem_object through ioctl Concurrency causes uaf judgment method: CONFIG_DRM is not configured No circumvention measures are involved: none(CVE-2022-1419) A concurrency use-after-free issue was discovered between reset_interrupt and floppy_end_request in the latest kernel version (5.17.5 for now). The root cause is that after deallocating current_req in floppy_end_request, reset_interrupt still holds the freed current_req->error_count and accesses it concurrently.(CVE-2022-1652)

References: https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1677, https://nvd.nist.gov/vuln/detail/CVE-2022-1205, https://nvd.nist.gov/vuln/detail/CVE-2022-1419, https://nvd.nist.gov/vuln/detail/CVE-2022-1652