CVE-2021-3736
published 2022-08-23CVE-2021-3736: A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated…
PriorityP424medium5.5CVSS 3.1
AVLACLPRLUINSUCHINAN
EPSS
0.24%
15.1th percentile
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux_kernel | <= 5.14.20 | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| msrc | cm1_kernel_5.10.134.1-2_on_cbl_mariner_1.0 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
osv5.5MEDIUM
vendor_debian5.5LOW
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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GHSA
GHSA-c24j-22f8-p2wg: A flaw was found in the Linux kernel
ghsa_unreviewed·2022-08-24
CVE-2021-3736 [MEDIUM] CWE-401 GHSA-c24j-22f8-p2wg: A flaw was found in the Linux kernel
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
OSV
CVE-2021-3736: A flaw was found in the Linux kernel
osv·2022-08-23·CVSS 5.5
CVE-2021-3736 [MEDIUM] CVE-2021-3736: A flaw was found in the Linux kernel
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
Microsoft
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attac
vendor_msrc·2022-08-09·CVSS 5.5
CVE-2021-3736 [MEDIUM] CWE-401 A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attac
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional pr
Red Hat
kernel: uninitialized kernel stack may lead to information disclosure
vendor_redhat·2021-11-03·CVSS 5.5
CVE-2021-3736 [MEDIUM] CWE-401 kernel: uninitialized kernel stack may lead to information disclosure
kernel: uninitialized kernel stack may lead to information disclosure
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
Statement: Red Hat did not include this code into their shipped versions of the Linux kernel and, thus, the vulnerability does not affect any version of Red Hat Enterprise Linux.
Mitigation: Mitigation for this issue is either not available or
Debian
CVE-2021-3736: linux - A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_...
vendor_debian·2021·CVSS 5.5
CVE-2021-3736 [MEDIUM] CVE-2021-3736: linux - A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_...
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/security/cve/CVE-2021-3736https://bugzilla.redhat.com/show_bug.cgi?id=1995570https://github.com/torvalds/linux/commit/de5494af4815a4c9328536c72741229b7de88e7fhttps://access.redhat.com/security/cve/CVE-2021-3736https://bugzilla.redhat.com/show_bug.cgi?id=1995570https://github.com/torvalds/linux/commit/de5494af4815a4c9328536c72741229b7de88e7f
2022-08-23
Published