CVE-2020-29534
published 2020-12-03CVE-2020-29534: An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a…
PriorityP336high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.45%
37.2th percentile
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.9.6-1 (bookworm) | linux 5.9.6-1 (bookworm) |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.9.6-1 | 5.9.6-1 |
| linux | linux_kernel | >= 0 < 5.9.6-1 | 5.9.6-1 |
| linux | linux_kernel | >= 0 < 5.9.6-1 | 5.9.6-1 |
| linux | linux_kernel | >= 0 < 5.9.6-1 | 5.9.6-1 |
| linux | linux_kernel | >= 5.1 < 5.8.18 | 5.8.18 |
| linux | linux_kernel | >= 5.9.0 < 5.9.3 | 5.9.3 |
| msrc | cm1_kernel_5.4.91-1_on_cbl_mariner_1.0 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.2HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
osv7.8HIGH
vendor_debian7.8HIGH
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu5.5MEDIUM
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GHSA
GHSA-6pj8-q9pf-wvp7: An issue was discovered in the Linux kernel before 5
ghsa_unreviewed·2022-05-24
CVE-2020-29534 [HIGH] GHSA-6pj8-q9pf-wvp7: An issue was discovered in the Linux kernel before 5
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.
OSV
linux, linux-hwe-5.8, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi vulnerabilities
osv·2021-01-06·CVSS 5.5
CVE-2020-12912 [MEDIUM] linux, linux-hwe-5.8, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi vulnerabilities
linux, linux-hwe-5.8, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi vulnerabilities
It was discovered that the AMD Running Average Power Limit (RAPL) driver in
the Linux kernel did not properly restrict access to power data. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-12912)
Jann Horn discovered that the io_uring subsystem in the Linux kernel did
not properly perform reference counting in some situations. A local
attacker could use this to expose sensitive information or possibly
escalate privileges. (CVE-2020-29534)
OSV
CVE-2020-29534: An issue was discovered in the Linux kernel before 5
osv·2020-12-03·CVSS 7.8
CVE-2020-29534 [HIGH] CVE-2020-29534: An issue was discovered in the Linux kernel before 5
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2021-01-06·CVSS 5.5
CVE-2020-12912 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the AMD Running Average Power Limit (RAPL) driver in
the Linux kernel did not properly restrict access to power data. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-12912)
Jann Horn discovered that the io_uring subsystem in the Linux kernel did
not properly perform reference counting in some situations. A local
attacker could use this to expose sensitive information or possibly
escalate privileges. (CVE-2020-29534)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, w
Microsoft
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request causing execve() to incorrectly optimize
vendor_msrc·2020-12-08·CVSS 7.8
CVE-2020-29534 [HIGH] An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request causing execve() to incorrectly optimize
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request causing execve() to incorrectly optimize unshare_fd() aka CID-0f2122045b94.
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 product
Red Hat
kernel: io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd() allowing for privileges escalation
vendor_redhat·2020-12-03·CVSS 7.8
CVE-2020-29534 [HIGH] CWE-266 kernel: io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd() allowing for privileges escalation
kernel: io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd() allowing for privileges escalation
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.
Package: kernel (Red Hat Enterprise Linux 5) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-alt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - N
Debian
CVE-2020-29534: linux - An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-r...
vendor_debian·2020·CVSS 7.8
CVE-2020-29534 [HIGH] CVE-2020-29534: linux - An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-r...
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.
Scope: local
bookworm: resolved (fixed in 5.9.6-1)
bullseye: resolved (fixed in 5.9.6-1)
forky: resolved (fixed in 5.9.6-1)
sid: resolved (fixed in 5.9.6-1)
trixie: resolved (fixed in 5.9.6-1)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugs.chromium.org/p/project-zero/issues/detail?id=2089https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ffhttps://bugs.chromium.org/p/project-zero/issues/detail?id=2089https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ff
2020-12-03
Published