CVE-2026-98403— s390/boot: Avoid IPL parameter append past command line
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.
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
Affected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 5ecb2da660ab8eddafe059a6a8a708465db89ca2< af9866021a00ab9eeacf0c33ee73f3d134b4ed70 |
affected |
5ecb2da660ab8eddafe059a6a8a708465db89ca2< 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf |
affected | ||
5ecb2da660ab8eddafe059a6a8a708465db89ca2< 8d11bfec8666f8409fac9072e9c25b691d3e30ac |
affected | ||
5ecb2da660ab8eddafe059a6a8a708465db89ca2< d76181dfabdaa720703167393704efacba343442 |
affected | ||
5.16 |
affected | ||
< 5.16 |
unaffected | ||
6.12.112≤ 6.12.* |
unaffected | ||
6.18.53≤ 6.18.* |
unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-98403
Vulnerability Information
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Vulnerability Title
s390/boot: Avoid IPL parameter append past command line
Source: CVE Program / CVE List V5
Vulnerability 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.
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
II. Public POCs for CVE-2026-98403
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-98403 (4)
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-2026-98399 | s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block | |
| 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-2026-98404 | 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 → →
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Same vendor: Linux
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CVE-2026-98431
RDMA/uverbs: Fix mmap_lock/disassociation_lock circular depe -
CVE-2026-98430
RDMA/efa: Keep admin queues alive while IRQ is registered -
CVE-2026-98429
RDMA/efa: Keep EQ resources alive while IRQ is registered -
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V. Comments for CVE-2026-98403
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