Vulnerability Description
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 5.9.1 |
| Fedoraproject | Fedora | 31 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2021/01/19/3Mailing ListThird Party Advisory
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073d0PatchVendor Advisory
- https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5ddPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202011-06Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-331.htmlPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/01/19/3Mailing ListThird Party Advisory
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073d0PatchVendor Advisory
- https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5ddPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2020-27675?
CVE-2020-27675 is a vulnerability with a CVSS score of 4.7 (MEDIUM). An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race conditi...
How severe is CVE-2020-27675?
CVE-2020-27675 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-27675?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Fedoraproject Fedora, Debian Debian Linux.