CVE-2025-27465

Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags.

For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.

References

Affected packages

Alpine:v3.22 / xen

Package

Name: xen
Purl: pkg:apk/alpine/xen?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.20.1-r0

Affected versions

4.*

4.0.1-r0

4.0.1-r1

4.0.1-r2

4.0.1-r3

4.1.0-r0

4.1.0-r1

4.1.0-r2

4.1.1-r0

4.1.1-r1

4.1.1-r2

4.1.2-r3

4.1.2-r4

4.1.2-r5

4.1.2-r6

4.1.2-r7

4.1.2-r8

4.1.2-r9

4.1.2-r10

4.1.2-r11

4.1.2-r12

4.1.3-r0

4.2.0-r0

4.2.0-r1

4.2.0-r2

4.2.0-r3

4.2.0-r4

4.2.0-r5

4.2.0-r6

4.2.0-r7

4.2.1-r0

4.2.1-r1

4.2.1-r2

4.2.1-r3

4.2.1-r4

4.2.1-r5

4.2.1-r6

4.2.1-r7

4.2.1-r8

4.2.1-r9

4.2.1-r10

4.2.1-r11

4.2.2-r0

4.2.2-r2

4.2.2-r3

4.2.2-r4

4.2.2-r5

4.2.2-r6

4.2.2-r7

4.2.2-r8

4.2.2-r9

4.2.2-r10

4.2.2-r11

4.3.0-r0

4.3.0-r1

4.3.0-r2

4.3.0-r3

4.3.0-r4

4.3.0-r5

4.3.0-r6

4.3.0-r7

4.3.0-r8

4.3.1-r0

4.3.1-r1

4.3.1-r2

4.3.1-r3

4.3.2-r0

4.3.2-r1

4.3.2-r2

4.3.2-r3

4.3.2-r4

4.3.3-r0

4.4.1-r0

4.4.1-r1

4.4.1-r2

4.4.1-r3

4.4.1-r4

4.4.1-r5

4.4.1-r6

4.4.1-r7

4.4.1-r8

4.4.2-r0

4.4.2-r1

4.5.0-r0

4.5.0-r1

4.5.1-r0

4.5.1-r1

4.5.1-r2

4.5.1-r3

4.6.0-r0

4.6.0-r1

4.6.0-r2

4.6.0-r3

4.6.0-r4

4.6.0-r5

4.6.1-r0

4.6.1-r1

4.6.1-r2

4.6.3-r0

4.6.3-r1

4.7.0-r0

4.7.0-r1

4.7.0-r2

4.7.0-r3

4.7.0-r4

4.7.0-r5

4.7.1-r0

4.7.1-r1

4.7.1-r2

4.7.1-r3

4.7.1-r4

4.7.1-r5

4.7.2-r0

4.8.1-r0

4.8.1-r1

4.8.1-r2

4.8.1-r3

4.8.1-r4

4.9.0-r0

4.9.0-r1

4.9.0-r2

4.9.0-r3

4.9.0-r4

4.9.0-r5

4.9.0-r6

4.9.0-r7

4.9.0-r8

4.9.1-r0

4.9.1-r1

4.9.1-r2

4.9.1-r3

4.10.0-r0

4.10.0-r1

4.10.0-r2

4.10.0-r3

4.10.1-r0

4.10.1-r1

4.10.1-r2

4.11.0-r0

4.11.0-r1

4.11.1-r0

4.11.1-r1

4.12.0-r0

4.12.0-r1

4.12.0-r2

4.12.0-r3

4.12.1-r0

4.12.1-r1

4.12.1-r2

4.13.0-r0

4.13.0-r1

4.13.0-r2

4.13.0-r3

4.13.0-r4

4.13.1-r0

4.13.1-r1

4.13.1-r2

4.13.1-r3

4.13.1-r4

4.13.1-r5

4.14.0-r0

4.14.0-r1

4.14.0-r2

4.14.0-r3

4.14.1-r0

4.14.1-r1

4.14.1-r2

4.14.1-r3

4.14.1-r4

4.14.1-r5

4.15.0-r0

4.15.0-r1

4.15.0-r2

4.15.0-r3

4.15.0-r4

4.15.0-r5

4.15.1-r0

4.15.1-r1

4.15.1-r2

4.15.1-r3

4.16.0-r0

4.16.0-r1

4.16.1-r0

4.16.1-r1

4.16.1-r2

4.16.1-r3

4.16.1-r4

4.16.1-r5

4.16.1-r6

4.16.1-r7

4.16.2-r0

4.16.2-r1

4.16.2-r2

4.16.2-r3

4.17.0-r0

4.17.0-r1

4.17.0-r2

4.17.0-r3

4.17.0-r4

4.17.0-r5

4.17.1-r0

4.17.1-r1

4.17.1-r2

4.17.1-r3

4.17.1-r4

4.17.1-r5

4.17.2-r0

4.17.2-r1

4.17.2-r2

4.17.2-r3

4.17.2-r4

4.18.0-r0

4.18.0-r1

4.18.0-r2

4.18.0-r3

4.18.0-r4

4.18.0-r5

4.18.2-r0

4.18.2-r1

4.18.2-r2

4.19.0-r0

4.19.0-r1

4.19.1-r0

4.19.1-r1

4.19.2-r0

4.20.0-r0

4.20.0-r1

Debian:11 / xen

Package

Name: xen
Purl: pkg:deb/debian/xen?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.14.2+25-gb6a8c4f72d-2

4.14.3-1~deb11u1

4.14.3-1

4.14.3+32-g9de3671772-1~deb11u1

4.14.3+32-g9de3671772-1

4.14.4+74-gd7b22226b5-1

4.14.5+24-g87d90d511c-1

4.14.5+86-g1c354767d5-1

4.14.5+94-ge49571868d-1

4.14.6-1

4.16.0-1~exp1

4.16.0+51-g0941d6cb-1

4.16.1-1

4.16.2-1

4.16.2-2

4.16.2+90-g0d39a6d1ae-1

4.17.0~rc4-1~exp1

4.17.0-1

4.17.0+24-g2f8851c37f-2~exp1

4.17.0+24-g2f8851c37f-2

4.17.0+46-gaaf74a532c-1

4.17.0+74-g3eac216e6e-1

4.17.1+2-gb773c48e36-1

4.17.2-1

4.17.2+55-g0b56bed864-1

4.17.2+76-ge1f9cb16e2-1~deb12u1

4.17.2+76-ge1f9cb16e2-1

4.17.3+10-g091466ba55-1~deb12u1

4.17.3+10-g091466ba55-1

4.17.3+10-g091466ba55-1.1~exp1

4.17.3+10-g091466ba55-1.1~exp2

4.17.3+10-g091466ba55-1.1

4.17.3+36-g54dacb5c02-1

4.17.5+23-ga4e5191dc0-1

4.19.0+14-g0918434e0f-1~exp1

4.19.1-1~exp1

4.19.1-1~exp4

4.19.1-1

4.20.0~rc2+1-gfcde5e0de8-1~exp1

4.20.0-1

4.20.0+68-g35cb38b222-1

Ecosystem specific

{
    "urgency": "end-of-life"
}

Debian:12 / xen

Package

Name: xen
Purl: pkg:deb/debian/xen?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.1+2-gb773c48e36-1

4.17.2-1

4.17.2+55-g0b56bed864-1

4.17.2+76-ge1f9cb16e2-1~deb12u1

4.17.2+76-ge1f9cb16e2-1

4.17.3+10-g091466ba55-1~deb12u1

4.17.3+10-g091466ba55-1

4.17.3+10-g091466ba55-1.1~exp1

4.17.3+10-g091466ba55-1.1~exp2

4.17.3+10-g091466ba55-1.1

4.17.3+36-g54dacb5c02-1

4.17.5+23-ga4e5191dc0-1

4.17.5+23-ga4e5191dc0-1+deb12u1

4.19.0+14-g0918434e0f-1~exp1

4.19.1-1~exp1

4.19.1-1~exp4

4.19.1-1

4.20.0~rc2+1-gfcde5e0de8-1~exp1

4.20.0-1

4.20.0+68-g35cb38b222-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / xen

Package

Name: xen
Purl: pkg:deb/debian/xen?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.1+2-gb773c48e36-1

4.17.2-1

4.17.2+55-g0b56bed864-1

4.17.2+76-ge1f9cb16e2-1~deb12u1

4.17.2+76-ge1f9cb16e2-1

4.17.3+10-g091466ba55-1~deb12u1

4.17.3+10-g091466ba55-1

4.17.3+10-g091466ba55-1.1~exp1

4.17.3+10-g091466ba55-1.1~exp2

4.17.3+10-g091466ba55-1.1

4.17.3+36-g54dacb5c02-1

4.17.5+23-ga4e5191dc0-1

4.19.0+14-g0918434e0f-1~exp1

4.19.1-1~exp1

4.19.1-1~exp4

4.19.1-1

4.20.0~rc2+1-gfcde5e0de8-1~exp1

4.20.0-1

4.20.0+68-g35cb38b222-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}