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CVE-2026-98171— smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

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： smb: 客户端：修复复合协议数据单元（PDU）中 next_buffer 的悬垂指针（Use-After-Free, UAF）及 NextCommand 边界检查问题 修复了 receive_encrypted_standard() 在处理复合加密帧时的若干相关边界检查与指针生命周期问题： 在将 next_buffer 赋值给 server->bigbuf 后，清空 next_buffer。残留的 next_buffer 指针可能在后续错误处理路径中导致使用已释放内存（U

CVSS 8.8 · High EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux b24df3e30cbf48255db866720fb71f14bf9d2f39< 72eaef1f37a3b6bec11c342736834dc3707be3e4 affected
b24df3e30cbf48255db866720fb71f14bf9d2f39< 491e33144dee872cffda207f6fcb09260728f803 affected
b24df3e30cbf48255db866720fb71f14bf9d2f39< 8749946579708ea0d339034bb7f423a67dbe89cf affected
b24df3e30cbf48255db866720fb71f14bf9d2f39< 96c436e4b010711452b2872558938f4ef276492a affected
b24df3e30cbf48255db866720fb71f14bf9d2f39< 858d5ac22cb889266993e7670f9f0c4f4aeedd78 affected
b24df3e30cbf48255db866720fb71f14bf9d2f39< 05762c5bc1cfdcac36747994fde2c04387a457f1 affected
4.19 affected
< 4.19 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-98171

Vulnerability Information
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Vulnerability Title
smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs Fix several related bounds checking and pointer lifecycle issues in receive_encrypted_standard()'s handling of compound encrypted frames: - Clear next_buffer after assigning it to server->bigbuf. A stale next_buffer pointer can lead to a use-after-free on subsequent error paths. - Update pdu_length to the decrypted plaintext size (buf_size). Using the pre-decryption length allows NextCommand to point into stale ciphertext residue. - Reject next_cmd values smaller than MID_HEADER_SIZE(server). - Fix an integer overflow in the upper bound check by verifying pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the trailing slice is large enough for a header.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 b24df3e30cbf48255db866720fb71f14bf9d2f39 ~ 72eaef1f37a3b6bec11c342736834dc3707be3e4 -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-98171

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III. Intelligence Information for CVE-2026-98171

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Patches & Fixes for CVE-2026-98171 (6)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98305 7.8 HIGH net: dsa: mxl862xx: disable the stats poll on teardown
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98311 7.8 HIGH wifi: virt_wifi: don't transfer operstate before register
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98171

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