CVE-2021-33033
published 2021-05-14CVE-2021-33033: The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI…
PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.57%
46.6th percentile
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.10.24-1 (bookworm) | linux 5.10.24-1 (bookworm) |
| linux | linux_kernel | >= 0 < 5.10.24-1 | 5.10.24-1 |
| linux | linux_kernel | >= 0 < 5.10.24-1 | 5.10.24-1 |
| linux | linux_kernel | >= 0 < 5.10.24-1 | 5.10.24-1 |
| linux | linux_kernel | >= 0 < 5.10.24-1 | 5.10.24-1 |
| linux | linux_kernel | >= 0 < 4.4.0-222.255 | 4.4.0-222.255 |
| linux | linux_kernel | >= 2.6.28 < 4.9.298 | 4.9.298 |
| linux | linux_kernel | >= 4.10 < 4.14.226 | 4.14.226 |
| linux | linux_kernel | >= 4.15 < 4.19.181 | 4.19.181 |
| linux | linux_kernel | >= 4.20 < 5.4.106 | 5.4.106 |
| linux | linux_kernel | >= 5.11 < 5.11.7 | 5.11.7 |
| linux | linux_kernel | >= 5.5 < 5.10.24 | 5.10.24 |
| msrc | cbl2_kernel_5.10.78.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cm1_kernel_5.10.60.1-1_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
nvdv2.04.6MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P
osv7.8HIGH
vendor_debian7.8HIGH
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu7.8HIGH
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Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2022-03-22·CVSS 7.8
CVE-2020-25673 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
It was discovered that the aufs file system in the Linux kernel did not
properly restrict mount namespaces, when mounted with the non-default
allow_userns option set. A local attacker could use this to gain
administrative privileges. (CVE-2016-2853)
It was discovered that the aufs file system in the Linux kernel did not
properly maintain POSIX ACL xattr data, when mounted with the non-default
allow_userns option. A local attacker could possibly us
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2021-06-08·CVSS 6.5
CVE-2021-28972 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Jan Beulich discovered that the Xen netback backend in the Linux kernel did
not properly handle certain error conditions under paravirtualization. An
attacker in a guest VM could possibly use this to cause a denial of service
(host domain crash). (CVE-2021-28038)
It was discovered that the Realtek RTL8188EU Wireless device driver in the
Linux kernel did not properly validate ssid lengths in some situations. An
attacker could use this to cause a denial of service (system crash).
(CVE-2021-28660)
It was discovered that the Xen paravirtualization backend in the Linux
kernel did not properly deallocate memory in some situations. A local
attacker could use this to cause a denial of service (
Microsoft
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled aka CID-ad5d07f4a9cd. T
vendor_msrc·2021-05-11·CVSS 7.8
CVE-2021-33033 [HIGH] CWE-416 The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled aka CID-ad5d07f4a9cd. T
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
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: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
vendor_redhat·2021-03-04·CVSS 7.8
CVE-2021-33033 [HIGH] CWE-416 kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
A flaw use-after-free in the Linux kernel CIPSO network packet labeling protocol functionality was found in the way user open local network connection with the usage of the security labeling that is IP option number 134. A local user could use this flaw to crash the system or possibly escalate their privileges on the system.
Statement: Considered to be Moderate rate, because by default CIPSO non-enabled and both no known way to reproduce the attack remotely and both it looks complex
Debian
CVE-2021-33033: linux - The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/i...
vendor_debian·2021·CVSS 7.8
CVE-2021-33033 [HIGH] CVE-2021-33033: linux - The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/i...
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
Scope: local
bookworm: resolved (fixed in 5.10.24-1)
bullseye: resolved (fixed in 5.10.24-1)
forky: resolved (fixed in 5.10.24-1)
sid: resolved (fixed in 5.10.24-1)
trixie: resolved (fixed in 5.10.24-1)
GHSA
GHSA-pjv2-crr6-xm2p: The Linux kernel before 5
ghsa_unreviewed·2022-05-24
CVE-2021-33033 [MEDIUM] CWE-416 GHSA-pjv2-crr6-xm2p: The Linux kernel before 5
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
OSV
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
osv·2022-03-22·CVSS 7.8
CVE-2022-0492 [HIGH] linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
It was discovered that the aufs file system in the Linux kernel did not
properly restrict mount namespaces, when mounted with the non-default
allow_userns option set. A local attacker could use this to gain
administrative privileges. (CVE-2016-2853)
It was discovered that the aufs file system in the Linux kernel did not
properly maintain POSIX ACL xattr data, when mounted with the non-default
allow_userns option. A local attacker could possibly use this to gain
elevated privileges. (CVE
OSV
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
osv·2021-06-08·CVSS 6.5
CVE-2021-28038 [MEDIUM] linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
Jan Beulich discovered that the Xen netback backend in the Linux kernel did
not properly handle certain error conditions under paravirtualization. An
attacker in a guest VM could possibly use this to cause a denial of service
(host domain crash). (CVE-2021-28038)
It was discovered that the Realtek RTL8188EU Wireless device driver in the
Linux kernel did not properly validate ssid lengths in some situations. An
attacker could use this to cause a denial of service (system crash).
(CVE-2021-28660)
It was discovered that the Xen paravirtualization backend in the Linux
kernel did not properly deallocate memory in some situations. A local
attacker could use this to cause a denial of s
OSV
CVE-2021-33033: The Linux kernel before 5
osv·2021-05-14·CVSS 7.8
CVE-2021-33033 [HIGH] CVE-2021-33033: The Linux kernel before 5
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopthttps://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701ehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopthttps://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e
2021-05-14
Published