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CVE-2026-89459s390/percpu: Fix MVIY_PERCPU() with older binutils

Description

In the Linux kernel, the following vulnerability has been resolved: s390/percpu: Fix MVIY_PERCPU() with older binutils Commit a737737cdb9c ("s390/percpu: Infrastructure for more efficient this_cpu operations") introduced MVIY_PERCPU(), which stringifies arguments that are already C string literals. This generates an assembler macro invocation with whitespace-separated quoted arguments: GEN_MVIY "459712" "%r3" GNU as versions prior to binutils 2.39 drop the separating whitespace between quoted macro arguments during input scrubbing. They consequently parse the invocation as a single argument and emit repeated warnings: Warning: missing closing `"' The .ifc in GEN_MVIY never matches and GNU as exits successfully without emitting the mviy instruction. As a result, the interrupted per-CPU sequence is not marked in lowcore and the exception return path cannot repair the per-CPU address register after migration. All MVIY_PERCPU() callers pass C string literals. Use them directly and separate the assembler macro arguments with an explicit comma. The resulting invocation is: GEN_MVIY 459712, %r3 This form is unambiguous for GNU as and LLVM's integrated assembler. This behavior was fixed in GNU as from binutils 2.39, but Linux supports binutils 2.30.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 38 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-89459, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Received3.1High7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.14% · top 96% of all CVEs (12 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.

Affected products

  • Linux · Linux

    • affected a737737cdb9c94e40a9926cdc2320f874c05d709 – < 91770b08a120967077ae78600612f18bc5ee3caf
    • affected a737737cdb9c94e40a9926cdc2320f874c05d709 – < 101782f8945a125044347312d74d488c05741c4a

  • Linux · Linux

    • affected 7.2
    • unaffected < 7.2
    • unaffected 7.2.4 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .