CVE-2026-98399s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block Unlike kdump, which passes the re-IPL parameter block through os_info, the stand-alone dump passes it through the IPL parm block address and checksum in lowcore. Some IPL types, like HMC FTP boot or QEMU direct kernel boot, might not provide an IPL parameter block. In this case reipl_type_init() selects IPL_TYPE_UNKNOWN and reipl_block_actual remains NULL. Nevertheless, dump_reipl_run() unconditionally dereferences it when preparing the lowcore fields. This may happen to work by chance when address zero contains readable lowcore data. A zero IPL parameter block address is then stored in lowcore, causing the stand-alone dumper to enter disabled wait after completing the dump. Explicitly store a zero IPL parameter block address and checksum when no re-IPL parameter block is available. This does not change the behavior: the stand-alone dumper completes the dump and halts, while valid re-IPL parameter blocks continue to be handled as before.
- 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 099b765139929efdcf232f8870804accf8c4cdc5 before 41647864e62b28388ecccc23a82f0e0a091f4ef2; from 099b765139929efdcf232f8870804accf8c4cdc5 before aed56fa3108b7095e6a048e134981506c056a6cb; 099b765139929efdcf232f8870804accf8c4cdc5 builds before 8d7988e8116c3d29d9e02ca9d37ee84577643f2d; from 099b765139929efdcf232f8870804accf8c4cdc5 before 280ff19853440d59e031cd8fe161e81305721262; 099b765139929efdcf232f8870804accf8c4cdc5 builds before 37f61b71cbc0caefc01022a19ee56fc2510e2e6e | CNA record |
References
- https://git.kernel.org/stable/c/41647864e62b28388ecccc23a82f0e0a091f4ef2
- https://git.kernel.org/stable/c/aed56fa3108b7095e6a048e134981506c056a6cb
- https://git.kernel.org/stable/c/8d7988e8116c3d29d9e02ca9d37ee84577643f2d
- https://git.kernel.org/stable/c/280ff19853440d59e031cd8fe161e81305721262
- https://git.kernel.org/stable/c/37f61b71cbc0caefc01022a19ee56fc2510e2e6e
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.