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CVE-2026-90153— ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size

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.

以下是该漏洞描述信息的中文翻译： 在 Linux 内核中，已修复了以下漏洞： ksmbd: 根据 DACL 大小限制 中的 ACE 遍历范围 会验证 DACL 是否完全位于 NT 安全描述符之内，但随后它使用 NTSD 的剩余长度（ ）而非 DACL 声明的大小（ ）来限制其两次 ACE 遍历的范围。 当 小于尾随 NTSD 缓冲区大小时，在权限检查过程中，位于 DACL 声明边界之后、但仍存储在安全描述符内的字节会被解析为 ACE。一个精心构造的 DACL 可以在 之外放置一个授予访问权限的 ACE，当前代码在

CVSS 8.1 · High EPSS 0.48% · P39

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8f0541186e9ad1b62accc9519cc2b7a7240272a7< a2051ffe452afad52f580b85a3fd8851933b1e7c affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< a29f57a14c939586d84d7fd6a029bd1fd170098f affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< a4a307d149327dad5fb25187e1b03cebd1b04de6 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< 8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< 79decd88dd3f0d42e7fb0689b1a7853bfa302459 affected
cb69d4d6f709f87c94afa28ae64c501576692171 affected
6e8f4abf584253cbaa596ea4ad13110cf61cd4c9 affected
8e33102309bd6839b2e2e158f93a7b378cb4655d affected
… +10 more rows
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I. Basic Information for CVE-2026-90153

Vulnerability Information
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Vulnerability Title
ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size smb_check_perm_dacl() validates that the DACL fits inside the NT security descriptor, but then bounds its two ACE walks by the remaining NTSD length (acl_size) rather than the DACL's declared size (pdacl_size). When pdacl->size is smaller than the trailing NTSD buffer, bytes after the declared DACL boundary - still inside the stored security descriptor - are parsed as ACEs during access checks. A crafted DACL can place an access-granting ACE beyond pdacl->size, and the current code accepts it during SMB2_CREATE access validation, while parse_dacl() and smb_inherit_dacl() stop at pdacl_size. Bound both ACE walks by pdacl_size to match the DACL boundary semantics used elsewhere in the server. Validation: - semantic KUnit harness shows the post-boundary ACE is selected before the fix and rejected (EACCES) after it - linux master (7.2-rc6), x86_64
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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 8f0541186e9ad1b62accc9519cc2b7a7240272a7 ~ a2051ffe452afad52f580b85a3fd8851933b1e7c -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-90153

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III. Intelligence Information for CVE-2026-90153

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Patches & Fixes for CVE-2026-90153 (5)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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