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CVE-2026-98867— dm-pcache: bound the logical key offset from persistent memory

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，以下漏洞已得到修复： dm-pcache：限制来自持久内存的逻辑键偏移量。 函数从缓存设备中获取键的逻辑偏移量，随后在 中通过该偏移量索引 数组。如果偏移量超出设备范围，将导致生成的子树指针指向数组之外，而 在重放过程中会向该非法地址写入数据，从而引发越界写入漏洞。 修复方案：在使用之前，拒绝长度为 0 的键，或者拒绝其偏移量与长度之和（按 64 位计算）超过设备大小的键。

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 3d5a87cb909c1f375f08065b20123fa5db5958d8 affected
1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 10449703200076980704894c3d68d6796182371b affected
1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 97fc4b53dbe4a983fdf093243067fa6a64562307 affected
6.18 affected
< 6.18 unaffected
6.18.52≤ 6.18.* unaffected
7.2.10≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-98867

Vulnerability Information
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Vulnerability Title
dm-pcache: bound the logical key offset from persistent memory
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: bound the logical key offset from persistent memory cache_key_decode() takes a key's logical off from the cache device and later indexes req_key_tree->subtrees[] by it in get_subtree(). An off past the device forms a subtree pointer outside the array, which rb_insert() writes through during replay. Reject a key of zero length, or whose off+len (computed in 64 bits) exceeds the device size, before it is used.
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 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 ~ 3d5a87cb909c1f375f08065b20123fa5db5958d8 -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-98867

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III. Intelligence Information for CVE-2026-98867

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Patches & Fixes for CVE-2026-98867 (3)

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-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
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-2026-98594 tg3: clean up PHYLIB resources on probe failure

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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