CVE-2026-98403s390/boot: Avoid IPL parameter append past command line
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Linux Linux linux:linux (from the name) | from 5ecb2da660ab8eddafe059a6a8a708465db89ca2 before af9866021a00ab9eeacf0c33ee73f3d134b4ed70; from 5ecb2da660ab8eddafe059a6a8a708465db89ca2 before 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf; from 5ecb2da660ab8eddafe059a6a8a708465db89ca2 before 8d11bfec8666f8409fac9072e9c25b691d3e30ac; from 5ecb2da660ab8eddafe059a6a8a708465db89ca2 before d76181dfabdaa720703167393704efacba343442 | CNA record |
References
- https://git.kernel.org/stable/c/af9866021a00ab9eeacf0c33ee73f3d134b4ed70
- https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf
- https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac
- https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.