CVE-2026-98403
In the Linux kernel, the following vulnerability has been resolved: s390/boot: Avoid IPL parameter append past command line A command line may occupy all but the terminating byte of COMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size to the IPL parameter conversion helpers and points the destination one byte past early_command_line. The helpers subtract one from the unsigned size and write the converted parameter outside the command line buffer. Convert the IPL parameter in the command line parsing buffer first. A parameter beginning with '=' can then replace the existing command line regardless of its length, while other parameters are appended only when space remains.
Affected versions
Linux kernel versions
5.16
and later are affected. Fixed in
6.12.112,
6.18.53,
7.2.7,
7.3-rc2
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-98403?
CVE-2026-98403 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.16 onward and has been patched in 6.12.112, 6.18.53, 7.2.7 and others. CVE-2026-98403 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98403?
Yes. CVE-2026-98403 has been patched. Fixed versions include 6.12.112, 6.18.53, 7.2.7 and others. If you are running Linux kernel 5.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98403 actively exploited?
No. CVE-2026-98403 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.