CVE-2020-15852

moderate-risk
Published 2020-07-20

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Do I need to act?

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0.16% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (5)

Xen

Affected Vendors

Linux Xen Netapp

References (10)

Mailing List http://www.openwall.com/lists/oss-security/2020/07/21/2
Patch http://xenbits.xen.org/xsa/advisory-329.html
Mailing List https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfa...
Patch https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f...
Third Party Advisory https://security.netapp.com/advisory/ntap-20200810-0001/
Mailing List http://www.openwall.com/lists/oss-security/2020/07/21/2
Patch http://xenbits.xen.org/xsa/advisory-329.html
Mailing List https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfa...
Patch https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f...
Third Party Advisory https://security.netapp.com/advisory/ntap-20200810-0001/
37
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 1/34 · Minimal
Exposure 12/34 · Low