CVE-2020-8428
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.66%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.66% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
- http://packetstormsecurity.com/files/157233/Kernel-Live-Patch-Security-Notice-LSN-0065-1.html
- http://www.openwall.com/lists/oss-security/2020/01/28/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/02/1
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0cb50185ae942b03c4327be322055d622dc79f6Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
- https://security.netapp.com/advisory/ntap-20200313-0003/
- https://usn.ubuntu.com/4318-1/
- https://usn.ubuntu.com/4319-1/
- https://usn.ubuntu.com/4320-1/
- https://usn.ubuntu.com/4324-1/
- https://usn.ubuntu.com/4325-1/
- https://www.debian.org/security/2020/dsa-4667
- https://www.debian.org/security/2020/dsa-4698
- https://www.openwall.com/lists/oss-security/2020/01/28/2Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
- http://packetstormsecurity.com/files/157233/Kernel-Live-Patch-Security-Notice-LSN-0065-1.html
- http://www.openwall.com/lists/oss-security/2020/01/28/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/02/1
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0cb50185ae942b03c4327be322055d622dc79f6Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
- https://security.netapp.com/advisory/ntap-20200313-0003/
- https://usn.ubuntu.com/4318-1/
- https://usn.ubuntu.com/4319-1/
- https://usn.ubuntu.com/4320-1/
- https://usn.ubuntu.com/4324-1/
- https://usn.ubuntu.com/4325-1/
- https://www.debian.org/security/2020/dsa-4667
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.