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CVE-2026-90323— ublk: validate auto buf reg before taking uring_cmd

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： ublk：在获取 uring_cmd 之前校验自动缓冲区注册 当使用 时，在 已设置 标志后，无效的 可能导致校验失败。此时 已标记为完成，但对应的 tag 仍处于 active 状态，可能导致设备卸载（teardown）过程中发生挂起。 修复方式： 将校验逻辑与缓冲区应用（apply）分离，使校验过程不产生任何副作用；随后再获取 ，并保存已校验通过的缓冲区。在 路径中也采用相同的处理顺序，确保在 进行状态检查之前，不会写入 ，从而避免状态不一致的问题。

AI Predicted 5.5 Difficulty: Hard

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 52460dda3a775a73f226312b43c0a0211e8665ea< 653d22269a8b83b491f7f186a5d7872f14e6ddca affected
52460dda3a775a73f226312b43c0a0211e8665ea< ca5a01eee34c7cbe0f531a613b0292a3ad1a419b affected
6.17 affected
< 6.17 unaffected
7.2.6≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-90323

Vulnerability Information
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Vulnerability Title
ublk: validate auto buf reg before taking uring_cmd
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ublk: validate auto buf reg before taking uring_cmd With UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after ublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The uring_cmd is completed while the tag stays active, which can hang teardown. Split validation from buffer apply so the check has no side effects, then take the uring_cmd and store the already-validated buffer. Apply the same order in FETCH so io->buf is not written before __ublk_fetch() state checks.
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 52460dda3a775a73f226312b43c0a0211e8665ea ~ 653d22269a8b83b491f7f186a5d7872f14e6ddca -
Linux Linux 6.17 -

II. Public POCs for CVE-2026-90323

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III. Intelligence Information for CVE-2026-90323

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Patches & Fixes for CVE-2026-90323 (2)

Same Patch Batch · Linux · 2026-09-17 · 602 CVEs total

CVE-2026-90255 Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90238 media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
CVE-2026-90240 iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90239 media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
CVE-2026-90241 iommu/vt-d: Tear down scalable-mode context on probe failure
CVE-2026-90243 iommu/vt-d: Clear Present bit before tearing down copied context entry
CVE-2026-90242 iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
CVE-2026-90244 iommu/dma: Restore locking around msi_page_list
CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
CVE-2026-90246 apparmor: fix integer overflow in verify_tags() bounds check
CVE-2026-90247 bpf: Fix mmap_lock leak in irq_work path
CVE-2026-90248 net/sched: cls_api: fix teardown of an adopted proto on insert-race loss
CVE-2026-90249 iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
CVE-2026-90250 bpf, cgroup: Fix storage null-ptr-deref after replacing prog
CVE-2026-90251 Bluetooth: MSFT: validate evt_prefix_len against the response length
CVE-2026-90253 Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
CVE-2026-90252 Bluetooth: MGMT: free the HCI command when it is cancelled
CVE-2026-90254 Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
CVE-2026-90256 Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90268 scsi: sd: Fix error handling in sd_probe() after large pool creation failure

Showing top 20 of 602 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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