CVE-2026-98593— s390/debug: Fix NULL pointer dereference in debug_info_copy()
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，以下漏洞已被修复： s390/debug：修复 debug_info_copy() 中的空指针解引用问题 当 debug_register_static() 调用失败时，该函数会清空 areas、active_pages 和 active_entries，但不会修改区域边界。此时，若通过打开其视图文件或调用 debug_dump() 来复制该区域，debug_info_copy() 将会解引用空指针，从而导致崩溃。 修复方案：当源区域不存在任何有效区域时，跳过复制循环。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-98593
Vulnerability Information
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Vulnerability Title
s390/debug: Fix NULL pointer dereference in debug_info_copy()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
s390/debug: Fix NULL pointer dereference in debug_info_copy()
When debug_register_static() fails, it clears areas, active_pages and
active_entries but leaves the area bounds unchanged. Copying such an
area, either by opening its view file or via debug_dump(), makes
debug_info_copy() dereference the NULL pointers.
Skip the copy loop when the source has no areas.
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-2026-98593
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-98593 (7)
Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total
| CVE-2026-98582 | nfc: st21nfca: validate received frame size | |
| CVE-2026-98568 | vxlan: use one headroom snapshot for neighbour replies | |
| CVE-2026-98570 | net: ipv6: keep room for the mac header in dst_dev_overhead() | |
| CVE-2026-98571 | net: stmmac: clear stale buf->page after recycling on skb build failure | |
| CVE-2026-98572 | bpf: Fix immediate JMP JEQ/JNE on MIPS32 | |
| CVE-2026-98573 | net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() | |
| CVE-2026-98574 | net: bcmgenet: stop Tx NAPI before disabling the queues | |
| CVE-2026-98575 | nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid() | |
| CVE-2026-98576 | nfc: llcp: fix slab-out-of-bounds reads when logging service names | |
| CVE-2026-98577 | nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap() | |
| CVE-2026-98578 | nfc: st21nfca: validate ISO15693 inventory length | |
| CVE-2026-98579 | nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure | |
| CVE-2026-98580 | nfc: llcp: Fix race condition in accept_queue lifecycle | |
| CVE-2026-98581 | nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm() | |
| CVE-2026-98594 | tg3: clean up PHYLIB resources on probe failure | |
| CVE-2026-98590 | bpf: Fix bpf_sock context code generation | |
| CVE-2026-98591 | bpf: Fix bounds check for skb-backed dynptrs | |
| CVE-2026-98592 | net: spacemit: clear TX descriptor on fragment mapping failure | |
| CVE-2026-98589 | bpf: Reject pkt arguments in mutating subprogs | |
| CVE-2026-98595 | udp: remove a disconnected socket from the 4-tuple hash table |
Showing top 20 of 436 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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Same vendor: Linux
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CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
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dm-pcache: bound the logical key offset from persistent memo -
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sched/cache: Introduce task_struct->sched_cache_grp to fix U -
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sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2026-98593
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