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CVE-2026-90151— NFSv4: remove callback IDR entry on client allocation failure

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，已解决以下漏洞： NFSv4：在客户端分配失败时移除回调 IDR 条目 在完成客户端初始化之前会分配一个 NFSv4.0 回调标识符。如果后续的任意初始化步骤失败，错误处理路径会直接调用 释放 。这绕过了 ，而回调 IDR 条目的移除通常正是在 的正常清理过程中完成的。 因此，分配失败可能导致 指向一个已释放的 。后续通过 进行 NFSv4.0 回调查找时，可能会找到该悬空指针并对其增加引用计数。 本次修复使回调 IDR 条目的移除辅助函数可被分配失败路径调用，并在释放客户端之前移除回调标识

CVSS 9.8 · Critical EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 68c721391b761dbe38d5b0094d2bb6e8489ad92b affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 7c4812eb96bdcafb31a65b12f2aa96659429d1d4 affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< fc95ca82d5ae598c428ab5a00ae69f8526d59371 affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 80b1c3d5a881f7d9081aa9f46da9742878a0f893 affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< 5891c03e150920618db0e9c4ea2d772abacdcfd1 affected
f4eecd5da3422e82e88e36c33cbd2595eebcacb1< d05c2007b3d84ccba11dc6e9cb3202768cc72f14 affected
… +10 more rows
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I. Basic Information for CVE-2026-90151

Vulnerability Information
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Vulnerability Title
NFSv4: remove callback IDR entry on client allocation failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 f4eecd5da3422e82e88e36c33cbd2595eebcacb1 ~ 68c721391b761dbe38d5b0094d2bb6e8489ad92b -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2026-90151

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III. Intelligence Information for CVE-2026-90151

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Patches & Fixes for CVE-2026-90151 (8)

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-2026-92489 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-2026-90425 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-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
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
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90151

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