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CVE-2026-98169— smb: client: fix potential OOB read in smb3_enum_snapshots()

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 smb3_enum_snapshots() 中潜在的越界读取漏洞 如果 snapshot_array_size 小于 GMT_TOKEN_SIZE，smb3_enum_snapshots() 会将 ret_data_len 设置为 sizeof(struct smb_snapshot_array)，而未验证服务器实际返回数据的长度。 由于 SMB2_ioctl() 对服务器提供的 OutputCount 未设置下限，并将 retbuf 分配为恰好等于该

CVSS 7.1 · High EPSS 0.43% · P36

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux e02789a53d71334b067ad72eee5d4e88a0158083< 15a221c734b9d044ab769e7e3606b2cab96fb65a affected
e02789a53d71334b067ad72eee5d4e88a0158083< 74995ee8305a7c4d76ee70d6acd996a75eda3c03 affected
e02789a53d71334b067ad72eee5d4e88a0158083< 210f0f1f67817e7d2348b86b5115a9b85ef5c98b affected
e02789a53d71334b067ad72eee5d4e88a0158083< 1cdf0d304d820fb13bf0faf532c3459600f9ea43 affected
e02789a53d71334b067ad72eee5d4e88a0158083< dbe452a905dfe2804647530a9ff3d7e3826ed04d affected
e02789a53d71334b067ad72eee5d4e88a0158083< 4775c3b7a597907e0b97556c7986fda238a377ae affected
a94703ff8e3647f8a9a3a92a468450299a7b77e9 affected
82a856f527334ffd69aae26e7dd9e03b19c4a520 affected
… +12 more rows
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I. Basic Information for CVE-2026-98169

Vulnerability Information
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Vulnerability Title
smb: client: fix potential OOB read in smb3_enum_snapshots()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential OOB read in smb3_enum_snapshots() If snapshot_array_size is smaller than GMT_TOKEN_SIZE, smb3_enum_snapshots() sets ret_data_len to sizeof(struct smb_snapshot_array) without verifying the actual length of the server's reply. Because SMB2_ioctl() places no lower bound on the server-supplied OutputCount and allocates retbuf to exactly that length, a short reply results in ret_data_len exceeding the size of retbuf. The subsequent copy_to_user() then reads past the end of retbuf, leaking adjacent slab memory to userspace. The subsequent clamp check is ineffective as it only reduces ret_data_len. Fix this by rejecting replies shorter than sizeof(struct smb_snapshot_array) with -EIO. Note that the bound is set to the 12-byte struct size rather than the 16-byte MIN_SNAPSHOT_ARRAY_SIZE defined in MS-SMB2 3.3.5.15.1, because 12 bytes is exactly what copy_to_user() attempts to read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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 e02789a53d71334b067ad72eee5d4e88a0158083 ~ 15a221c734b9d044ab769e7e3606b2cab96fb65a -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-98169

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III. Intelligence Information for CVE-2026-98169

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Patches & Fixes for CVE-2026-98169 (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-2026-98171 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-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98369 7.8 HIGH xfrm: add missing rcu_read_lock(), skb_dst_force() and dev_hold() for xfrm_trans_reinject(
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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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