CVE-2020-27675
Last modified
CVE-2020-27675 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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). EPSS estimates a 0.27% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 5.9.1 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Debian | Debian Linux | 9.0 |
References
- http://www.openwall.com/lists/oss-security/2021/01/19/3Mailing List, Third Party Advisory
- https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5dd2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202011-06Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-331.htmlPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/01/19/3Mailing List, Third Party Advisory
- https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5dd2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202011-06Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-331.htmlPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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