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CVE-2021-23133

Published: 22/04/2021 Updated: 07/11/2023
CVSS v2 Base Score: 6.9 | Impact Score: 10 | Exploitability Score: 3.4
CVSS v3 Base Score: 7 | Impact Score: 5.9 | Exploitability Score: 1
VMScore: 615
Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C
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Vulnerability Summary

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) prior to 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

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linux linux kernel

fedoraproject fedora 32

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fedoraproject fedora 34

debian debian linux 9.0

netapp cloud backup -

netapp solidfire \\& hci management node -

broadcom brocade fabric operating system -

netapp h410c_firmware -

netapp h300s_firmware -

netapp h500s_firmware -

netapp h700s_firmware -

netapp h300e_firmware -

netapp h500e_firmware -

netapp h700e_firmware -

netapp h410s_firmware -

netapp solidfire_baseboard_management_controller_firmware -

Vendor Advisories

Amazon Linux AMI: ALAS-2021-1503
kernel: refcount leak in llcp_sock_bind() (CVE-2020-25670) kernel: refcount leak in llcp_sock_connect() (CVE-2020-25671) kernel: memory leak in llcp_sock_connect() (CVE-2020-25672) An issue was discovered in the Linux kernel related to mm/gupc and mm/huge_memoryc The get_user_pages (aka gup) implementation, when used for a copy-on-write page, do ...
Arch Linux Issues:
A race condition was found in the Linux kernel in sctp_destroy_sock If sctp_destroy_sock is called without sock_net(sk)->sctpaddr_wq_lock held and sp->do_auto_asconf is true, then an element is removed from the auto_asconf_splist without any proper locking ...
Amazon Linux 2: ALAS2-2021-1636
An issue was discovered in the Linux kernel related to mm/gupc and mm/huge_memoryc The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access (CVE-2020-29374) A use-after-free flaw was found in the Linux kernel's SCT ...
Amazon Linux 2: ALAS2KERNEL-5.4-2022-003
A use-after-free flaw was found in the Linux kernel's NFC LLCP protocol implementation in the way the user performs manipulation with an unknown input for the llcp_sock_bind() function This flaw allows a local user to crash or escalate their privileges on the system (CVE-2020-25670) A use-after-free flaw was found in the Linux kernel's NFC LLCP p ...
Amazon Linux 2: ALAS2KERNEL-5.10-2022-001
A use-after-free flaw was found in the Linux kernel's NFC LLCP protocol implementation in the way the user performs manipulation with an unknown input for the llcp_sock_bind() function This flaw allows a local user to crash or escalate their privileges on the system (CVE-2020-25670) A use-after-free flaw was found in the Linux kernel's NFC LLCP p ...

Mailing Lists

Full Disclosure: CVE-2021-23133: Linux kernel: race condition in sctp sockets
<!--X-Body-Begin--> <!--X-User-Header--> oss-sec mailing list archives <!--X-User-Header-End--> <!--X-TopPNI--> By Date By Thread </form> <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> CVE-2021-23133: Linux kernel: race condition in sctp sockets <!--X-Subject-Header-End--> <!--X-Head-of-Message--> From: Or C ...
Full Disclosure: Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets
<!--X-Body-Begin--> <!--X-User-Header--> oss-sec mailing list archives <!--X-User-Header-End--> <!--X-TopPNI--> By Date By Thread </form> <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets <!--X-Subject-Header-End--> <!--X-Head-of-Message--> From: ...

References

CWE-362https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5bhttps://www.openwall.com/lists/oss-security/2021/04/18/2http://www.openwall.com/lists/oss-security/2021/05/10/1http://www.openwall.com/lists/oss-security/2021/05/10/2http://www.openwall.com/lists/oss-security/2021/05/10/3http://www.openwall.com/lists/oss-security/2021/05/10/4https://security.netapp.com/advisory/ntap-20210611-0008/https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlhttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/https://nvd.nist.govhttps://alas.aws.amazon.com/ALAS-2021-1503.html
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