CVE-2020-15852

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-20 · updated 2026-06-17
Weakness: CWE-276

Description

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.

Affected products

Linux kernel: from 5.5 through 5.7.9
NetApp Cloud Backup: all versions
NetApp Solidfire Baseboard Management Controller: all versions
NetApp Steelstore Cloud Integrated Storage: all versions
xen: through 4.13.1

References

http://www.openwall.com/lists/oss-security/2020/07/21/2
http://xenbits.xen.org/xsa/advisory-329.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2
https://security.netapp.com/advisory/ntap-20200810-0001/
http://www.openwall.com/lists/oss-security/2020/07/21/2
http://xenbits.xen.org/xsa/advisory-329.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2
https://security.netapp.com/advisory/ntap-20200810-0001/

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