Bug 1941781 (CVE-2021-28972) - CVE-2021-28972 kernel: Buffer overflow in hotplug/rpadlpar_sysfs.c
Summary: CVE-2021-28972 kernel: Buffer overflow in hotplug/rpadlpar_sysfs.c
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-28972
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1943622 1941782 1943435 1943436 1943437 1943438
Blocks: 1941783
TreeView+ depends on / blocked
 
Reported: 2021-03-22 18:58 UTC by Pedro Sampaio
Modified: 2022-05-05 14:01 UTC (History)
42 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw in the Linux kernels implementation of the RPA PCI Hotplug driver for power-pc. A user with permissions to write to the sysfs settings for this driver can trigger a buffer overflow when writing a new device name to the driver from userspace, overwriting data in the kernel's stack.
Clone Of:
Environment:
Last Closed: 2021-11-08 01:43:15 UTC
Embargoed:

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Description Pedro Sampaio 2021-03-22 18:58:30 UTC 
A flaw in the Linux kernels implementation of the RPA PCI Hotplug driver.  A user with permissions to write to the sysfs settings for this driver can trigger a buffer overflow when writing a new device name to the driver from userspace, overwriting data in the kernel's stack.

At this time this driver is only used by Power-PC based systems and does not affect x86-64, ARM, s390 architectures.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc7a0bb058b85ea03db87169c60c7cfdd5d34678
Comment 1 Pedro Sampaio 2021-03-22 18:59:08 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1941782]
Comment 2 Wade Mealing 2021-03-26 02:57:21 UTC 
This only affects the powerpc architecture, so its not affecting or built for x86 or ARM.
Comment 4 Wade Mealing 2021-03-26 03:35:36 UTC 
This flaw is rated as moderate, the sysfs file requires root or CAP_SYS_ADMIN priledges to be able to abuse this flaw.
Comment 6 Wade Mealing 2021-03-26 03:56:39 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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