Race Condition The advisory has been revoked - it doesn't affect any version of package kernel-cross-headers (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS8-KERNELCROSSHEADERS-1969916
- published26 Jul 2021
- disclosed18 Jul 2021
Introduced: 18 Jul 2021
CVE-2021-3640 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by Centos.
A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.
References
- https://access.redhat.com/security/cve/CVE-2021-3640
- https://access.redhat.com/errata/RHSA-2022:7683
- https://lkml.org/lkml/2021/8/28/238
- https://bugzilla.redhat.com/show_bug.cgi?id=1980646
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951
- https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://security.netapp.com/advisory/ntap-20220419-0003/
- https://ubuntu.com/security/CVE-2021-3640
- https://www.debian.org/security/2022/dsa-5096
- https://www.openwall.com/lists/oss-security/2021/07/22/1