CVE-2026-98403s390/boot: Avoid IPL parameter append past command line
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 19 days later
· 19 days later
Published
- 5 days later
· 5 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 5ecb2da660ab8eddafe059a6a8a708465db89ca2 – < af9866021a00ab9eeacf0c33ee73f3d134b4ed70
- affected 5ecb2da660ab8eddafe059a6a8a708465db89ca2 – < 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf
- affected 5ecb2da660ab8eddafe059a6a8a708465db89ca2 – < 8d11bfec8666f8409fac9072e9c25b691d3e30ac
- affected 5ecb2da660ab8eddafe059a6a8a708465db89ca2 – < d76181dfabdaa720703167393704efacba343442
- affected 5.16
- unaffected < 5.16
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/af9866021a00ab9eeacf0c33ee73f3d134b4ed70 (opens in a new tab)
- https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf (opens in a new tab)
- https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac (opens in a new tab)
- https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-101052 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98403)Record last updated .