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CVE-2026-98399— s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： s390/ipl：修复在缺少重新 IPL 参数块时 dump_reipl 中的 NULL 解引用问题 与 kdump 通过 os_info 传递重新 IPL（Initial Program Load，初始程序加载）参数块不同，独立转储（stand-alone dump）通过低地址核心（lowcore）中的 IPL 参数块地址和校验和来传递该参数块。 某些 IPL 类型（例如 HMC FTP 引导或 QEMU 直接内核引导）可能不提供 IPL 参数块。在这种情况下， 会将 作

AI Predicted 3.3 Difficulty: Hard EPSS 0.21% · P10

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 099b765139929efdcf232f8870804accf8c4cdc5< 41647864e62b28388ecccc23a82f0e0a091f4ef2 affected
099b765139929efdcf232f8870804accf8c4cdc5< aed56fa3108b7095e6a048e134981506c056a6cb affected
099b765139929efdcf232f8870804accf8c4cdc5< 8d7988e8116c3d29d9e02ca9d37ee84577643f2d affected
099b765139929efdcf232f8870804accf8c4cdc5< 280ff19853440d59e031cd8fe161e81305721262 affected
099b765139929efdcf232f8870804accf8c4cdc5< 37f61b71cbc0caefc01022a19ee56fc2510e2e6e affected
2.6.30 affected
< 2.6.30 unaffected
6.6.158≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-98399

Vulnerability Information
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Vulnerability Title
s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 099b765139929efdcf232f8870804accf8c4cdc5 ~ 41647864e62b28388ecccc23a82f0e0a091f4ef2 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-98399

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III. Intelligence Information for CVE-2026-98399

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Other References for CVE-2026-98399 (3)

Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total

CVE-2026-98398 locking/lockdep: Invalidate stale class_cache entries for zapped classes
CVE-2026-98396 powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
CVE-2026-98391 drm/xe: Guard page-fault worker with runtime PM check
CVE-2026-98389 drm/amdgpu: skip gfx switch_power_profile during GPU reset
CVE-2026-98388 exec: do_close_on_exec() before taking exec_update_lock
CVE-2026-98387 s390/crypto: Fix skcipher_walk return code handling in aes_s390
CVE-2026-98386 scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot
CVE-2026-98390 x86/amd_node: Avoid divide by zero on virtualized systems
CVE-2026-98397 platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown
CVE-2026-98395 powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
CVE-2026-98400 s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVE-2026-98402 net: icmp: avoid invalid transport header access in icmp_send tracepoint
CVE-2026-98401 net: iptunnel: fix stale transport header during tunnel decapsulation
CVE-2026-98403 s390/boot: Avoid IPL parameter append past command line
CVE-2026-98404 drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()
CVE-2026-98405 smb: client: fix missing iov bounds check in parse_posix_sids()
CVE-2026-98406 wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver
CVE-2026-98408 watchdog: rzv2h: Avoid division by zero
CVE-2026-98407 wifi: rsi: fix heap OOB write on key removal

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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