CVE-2026-79603
CVE-2026-79603 · Unconditionally do TLB flushing ahead of page scrubbing
This page contains facts from public vulnerability sources. Check the original advisory before updating.
x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen (if needed) when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbed page.
CVSS 4.3 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
xen
- Versions
- consult Xen advisory XSA-511: Unknown
No fix published
xen Debian:12
- Versions
- 4.17.1+2-gb773c48e36-1
- 4.17.2+55-g0b56bed864-1
- 4.17.2+76-ge1f9cb16e2-1
- 4.17.2+76-ge1f9cb16e2-1~deb12u1
- 4.17.2-1
- 4.17.3+10-g091466ba55-1
- 4.17.3+10-g091466ba55-1.1
- 4.17.3+10-g091466ba55-1.1~exp1
- 4.17.3+10-g091466ba55-1.1~exp2
- 4.17.3+10-g091466ba55-1~deb12u1
- 4.17.3+36-g54dacb5c02-1
- 4.17.5+23-ga4e5191dc0-1
- 4.17.5+23-ga4e5191dc0-1+deb12u1
- 4.17.5+72-g01140da4e8-1
- 4.17.7-0+deb12u1
- 4.19.0+14-g0918434e0f-1~exp1
- 4.19.1-1
- 4.19.1-1~exp1
- 4.19.1-1~exp4
- 4.20.0+68-g35cb38b222-1
- 4.20.0-1
- 4.20.0~rc2+1-gfcde5e0de8-1~exp1
- 4.20.2+37-g61ff35323e-1
- 4.20.2+7-g1badcf5035-1
- 4.20.2+7-g1badcf5035-2
- 4.20.3+127-gc42374a105-1
- 4.20.4+39-gf1e1321c87-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Debian:13
- Versions
- 4.20.0+68-g35cb38b222-1
- 4.20.2+37-g61ff35323e-0+deb13u1
- 4.20.2+37-g61ff35323e-1
- 4.20.2+7-g1badcf5035-0+deb13u1
- 4.20.2+7-g1badcf5035-1
- 4.20.2+7-g1badcf5035-2
- 4.20.3+127-gc42374a105-0+deb13u1
- 4.20.3+127-gc42374a105-1
- Affected ranges
- ECOSYSTEM: < 4.20.4+39-gf1e1321c87-0+deb13u1
Update to 4.20.4+39-gf1e1321c87-0+deb13u1
xen Debian:14
- Versions
- 4.20.0+68-g35cb38b222-1
- 4.20.2+37-g61ff35323e-1
- 4.20.2+7-g1badcf5035-1
- 4.20.2+7-g1badcf5035-2
- 4.20.3+127-gc42374a105-1
- Affected ranges
- ECOSYSTEM: < 4.20.4+39-gf1e1321c87-1
Update to 4.20.4+39-gf1e1321c87-1
xen Ubuntu:16.04:LTS
- Versions
- 4.5.1-0ubuntu1
- 4.5.1-0ubuntu2
- 4.6.0-1ubuntu1
- 4.6.0-1ubuntu2
- 4.6.0-1ubuntu4
- 4.6.0-1ubuntu4.1
- 4.6.0-1ubuntu4.2
- 4.6.0-1ubuntu4.3
- 4.6.5-0ubuntu1
- 4.6.5-0ubuntu1.1
- 4.6.5-0ubuntu1.2
- 4.6.5-0ubuntu1.4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:18.04:LTS
- Versions
- 4.9.0-0ubuntu3
- 4.9.0-0ubuntu4
- 4.9.2-0ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:20.04:LTS
- Versions
- 4.9.2-0ubuntu2
- 4.9.2-0ubuntu6
- 4.9.2-0ubuntu7
- 4.11.3+24-g14b62ab3e5-1ubuntu1
- 4.11.3+24-g14b62ab3e5-1ubuntu2
- 4.11.3+24-g14b62ab3e5-1ubuntu2.2
- 4.11.3+24-g14b62ab3e5-1ubuntu2.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:22.04:LTS
- Versions
- 4.11.4+24-gddaaccbbab-1ubuntu2
- 4.16.0-1~ubuntu2
- 4.16.0-1~ubuntu2.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:24.04:LTS
- Versions
- 4.17.2-1
- 4.17.2+55-g0b56bed864-1
- 4.17.2+76-ge1f9cb16e2-1
- 4.17.2+76-ge1f9cb16e2-1ubuntu1
- 4.17.3+10-g091466ba55-1
- 4.17.3+10-g091466ba55-1.1ubuntu2
- 4.17.3+10-g091466ba55-1.1ubuntu3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:26.10
- Versions
- 4.20.2+7-g1badcf5035-2build2
- 4.20.2+37-g61ff35323e-1ubuntu1
- 4.20.3+127-gc42374a105-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:26.04:LTS
- Versions
- 4.20.0+68-g35cb38b222-1
- 4.20.2+7-g1badcf5035-2
- 4.20.2+7-g1badcf5035-2build2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published