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CVE-2026-98901— ksmbd: fix lease break and ack state handling

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： ksmbd：修复租约中断（lease break）与确认（ack）状态的处理逻辑 在针对写入和截断操作中断二级/只读租约时，不应跳过包含 WRITE_CACHING 的有效租约状态。 依据 SMB2 协议规则处理租约中断确认：确认后的状态必须是服务器中断目标状态的子集。直接应用已确认的状态，并在确认失败时保持中断挂起（pending）。

AI Predicted 7.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 17699905a381621c1cee5b6528feb05acedc86a4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3251ea36df5eef58aa207fbee48849d89b922ea6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fba4653a0b4dc2f6d42600abe21fb326292f70ff affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5015191096db311759fef98769270336cd8b1324 affected
< 6.6.158 affected
< 6.12.111 affected
< 6.18.53 affected
6.6.158≤ 6.6.* unaffected
… +3 more rows
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I. Basic Information for CVE-2026-98901

Vulnerability Information
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Vulnerability Title
ksmbd: fix lease break and ack state handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix lease break and ack state handling Do not skip valid lease states containing WRITE_CACHING when breaking level-II/read leases for writes and truncates. Handle lease break acknowledgments according to the SMB2 rule that the acknowledged state must be a subset of the server's break target. Apply the acknowledged state directly and keep the break pending on failed ACKs.
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 17699905a381621c1cee5b6528feb05acedc86a4 -
Linux Linux 6.6.158 ~ 6.6.* -

II. Public POCs for CVE-2026-98901

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III. Intelligence Information for CVE-2026-98901

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Patches & Fixes for CVE-2026-98901 (4)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98938 rust: irq: pass RegistrationInner as cookie to request_irq
CVE-2026-98951 riscv: ptrace: Zero-initialize regset buffers before copyin
CVE-2026-98950 flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()
CVE-2026-98949 drm/imagination: Fix reference and vm_bo handling in remap()
CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
CVE-2026-98947 vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
CVE-2026-98946 drm/vc4: Disable the V3D interrupt across runtime suspend
CVE-2026-98945 HID: steam: Rearrange teardown sequence
CVE-2026-98944 HID: steam: Refactor registration
CVE-2026-98943 HID: steam: Clean up locking
CVE-2026-98942 sched_ext: Build the cid tables privately and publish them with RCU
CVE-2026-98941 ext4: don't enable large folios on encrypted inodes
CVE-2026-98940 ASoC: qcom: lpass-cpu: use DAI table index for playback constraints
CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing
CVE-2026-98927 KVM: arm64: nv: Fix life cycle of the nested_mmus array
CVE-2026-98930 KVM: s390: Fix IRQ injection with SIGP Stop and Store Status
CVE-2026-98929 macsec: initialize SecY before registering the netdevice
CVE-2026-98928 KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
CVE-2026-98931 mtd: spinand: fix NULL pointer dereference with no ECC engine
CVE-2026-98926 drm/amd/display: Remove sink usage from DPMS

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98901

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