CVE-2026-89459

CVE CVE-2026-89459EUVD EUVD-2026-76365Published 2026-09-11T19:43:22.000ZLast changed 2026-09-13T06:29:33.000ZCVSS 7.0

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 7.2; a737737cdb9c94e40a9926cdc2320f874c05d709 <91770b08a120967077ae78600612f18bc5ee3caf; patch: 7.2.4; patch: 7.3-rc1; patch: 0; a737737cdb9c94e40a9926cdc2320f874c05d709 <101782f8945a125044347312d74d488c05741c4a

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Carried in the product catalogue

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Linux — Linux

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