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CVE-2026-98318— smb: client: validate absolute native symlink targets before NT fixups

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：在 NT 修复（fixups）之前，验证绝对原生符号链接（symlink）的目标路径 当未设置 时，绝对目标路径会被原样复制，未转换为 NT 驱动器路径。后续代码在修改目标路径和计算打印名称长度时，仍假定存在 NT 前缀。 对于路径如 "/ab"，这会导致两处内存越界写入错误： 和 被写入超出其分配空间的内存位置；同时， 从长度为 6 字节的 UTF-16 目标路径中减去假设存在的 8 字节前缀，导致 类型的 下溢并环绕（wrap）为 65534。该下溢进而

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 3363da82e02f1bddc54faa92ea430c6532e2cd2e< 6913ff607c2bc8694193e1fcc40bf16d75f35f16 affected
3363da82e02f1bddc54faa92ea430c6532e2cd2e< 23c240d9509e15f72e4112fc95f0160ab32ec430 affected
b6ea7b6c6be65149ab6b8e37a9dd1671f76add1b affected
6.15.6< 6.16 affected
6.16 affected
< 6.16 unaffected
7.2.8≤ 7.2.* unaffected
7.3-rc4≤ * unaffected
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I. Basic Information for CVE-2026-98318

Vulnerability Information
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Vulnerability Title
smb: client: validate absolute native symlink targets before NT fixups
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate absolute native symlink targets before NT fixups With symlinkroot unset, an absolute target is copied without conversion to an NT drive path. Later code still assumes an NT prefix is present when modifying the target and calculating the print name length. For "/ab", this causes two failures: sym[5] and path[5] are written past their allocations, and plen -= 2 * poff subtracts an assumed 8-byte prefix from a 6-byte UTF-16 target, wrapping u16 plen to 65534. That underflow causes another overflow: memcpy() copies 65534 bytes into a 24-byte buffer. A user with write access to a mounted share can trigger these bugs with default settings. Validate the NT drive prefix, including an ASCII drive letter, before accessing fixed offsets or subtracting the prefix length.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 3363da82e02f1bddc54faa92ea430c6532e2cd2e ~ 6913ff607c2bc8694193e1fcc40bf16d75f35f16 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-98318

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III. Intelligence Information for CVE-2026-98318

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Patches & Fixes for CVE-2026-98318 (2)

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-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
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-2026-98320 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-2026-98315 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()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race

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-2026-98318

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