CVE-2026-98403 is a vulnerability in Linux Kernel
Published on October 14, 2026
s390/boot: Avoid IPL parameter append past command line
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.
Products Associated with CVE-2026-98403
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Affected Versions
Linux:- Version 5ecb2da660ab8eddafe059a6a8a708465db89ca2 and below af9866021a00ab9eeacf0c33ee73f3d134b4ed70 is affected.
- Version 5ecb2da660ab8eddafe059a6a8a708465db89ca2 and below 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf is affected.
- Version 5ecb2da660ab8eddafe059a6a8a708465db89ca2 and below 8d11bfec8666f8409fac9072e9c25b691d3e30ac is affected.
- Version 5ecb2da660ab8eddafe059a6a8a708465db89ca2 and below d76181dfabdaa720703167393704efacba343442 is affected.
- Version 5.16 is affected.
- Before 5.16 is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.