Description
The (1) do_send and (2) do_recv functions in io.c in libvchan in Xen 4.2.x, 4.3.x, and 4.4-RC series allows local guests to cause a denial of service or possibly gain privileges via crafted xenstore ring indexes, which triggers a "read or write past the end of the ring."
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xen | 4.4.0-1 | — |
| Debian 13 | xen | 4.4.0-1 | — |
| Debian 12 | xen | 4.4.0-1 | — |
References
- http://xenbits.xen.org/xsa/xsa86.patch
- http://xenbits.xen.org/xsa/advisory-86.html
- SUSE-SU-2014:0373 vendor-advisory
- GLSA-201407-03 vendor-advisory
- [oss-security] 20140210 Xen Security Advisory 86 (CVE-2014-1896) - libvchan failure handling malicious ring indexes mailing-list
- [oss-security] 20140207 Re: Xen Security Advisory 84 - integer overflow in several XSM/Flask hypercalls mailing-list