Unrated severityNVD Advisory· Published May 22, 2024· Updated May 4, 2025
comedi: dt9812: fix DMA buffers on stack
CVE-2021-47477
Description
In the Linux kernel, the following vulnerability has been resolved:
comedi: dt9812: fix DMA buffers on stack
USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail.
Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data.
Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
101- osv-coords99 versionspkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%20Micro%205.3pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%20Micro%205.4pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%20Micro%205.3pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%20Micro%205.4pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-rt_debug&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%20Micro%205.3pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%20Micro%205.4pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-source-rt&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-syms-rt&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.5pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP5pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-default-base&distro=SUSE%20Manager%20Proxy%204.3pkg:rpm/suse/kernel-default-base&distro=SUSE%20Manager%20Server%204.3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP4pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Manager%20Proxy%204.3pkg:rpm/suse/kernel-default&distro=SUSE%20Manager%20Server%204.3pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP5pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-livepatch-SLE15-SP4_Update_27&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4pkg:rpm/suse/kernel-livepatch-SLE15-SP5-RT_Update_16&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP5pkg:rpm/suse/kernel-livepatch-SLE15-SP5_Update_15&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP5pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP5pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP5pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP5pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-source&distro=SUSE%20Manager%20Proxy%204.3pkg:rpm/suse/kernel-source&distro=SUSE%20Manager%20Server%204.3pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP5pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP5pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP5pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/kernel-syms&distro=SUSE%20Manager%20Proxy%204.3pkg:rpm/suse/kernel-syms&distro=SUSE%20Manager%20Server%204.3pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP5pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Manager%20Server%204.3
< 5.14.21-150500.55.68.1+ 98 more
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- (no CPE)range: < 1-150400.9.3.2
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- (no CPE)range: < 5.14.21-150400.24.122.1
- (no CPE)range: < 5.14.21-150500.55.68.1
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- (no CPE)range: < 5.14.21-150400.24.122.1
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- (no CPE)range: < 5.14.21-150500.13.58.1
- (no CPE)range: < 5.14.21-150500.55.68.1
- (no CPE)range: < 5.14.21-150400.24.122.2
- (no CPE)range: < 5.14.21-150400.24.122.2
Patches
Vulnerability mechanics
References
9- git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757emitre
- git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2mitre
- git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3mitre
- git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12edmitre
- git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efemitre
- git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3mitre
- git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6mitre
- git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97mitre
- git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723mitre
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