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CVE-2021-20219

Published: 23/03/2021 Updated: 26/03/2021
CVSS v2 Base Score: 2.1 | Impact Score: 2.9 | Exploitability Score: 3.9
CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8
VMScore: 187
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P
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Vulnerability Summary

A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability.

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Mailing Lists

Full Disclosure: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> <!-- ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> <!-- ...
Full Disclosure: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> <!-- ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...
Full Disclosure: Re: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS
<!--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: Re: CVE-2021-20219 Linux kernel: improper synchronization in flush_to_ldisc() can lead to DoS <!--X-Subject-Header-End--> ...

References

CWE-697https://bugzilla.redhat.com/show_bug.cgi?id=1923738https://nvd.nist.govhttp://seclists.org/oss-sec/2021/q1/222
VMScore
CVSSv2
CVSSv3
VMScore
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