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CVE-2026-93261— locking/lockdep: Fix NULL pointer dereference in __lock_set_class()

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： locking/lockdep：修复 __lock_set_class() 中的空指针解引用问题 当锁类池耗尽、graph_lock() 失败或密钥验证失败时，register_lock_class() 可能返回 NULL。然而，__lock_set_class() 在未进行空指针检查的情况下，直接将返回值用于指针运算： class = register_lock_class(lock, subclass, 0); hlock->class_idx = class - lo

AI Predicted 5.5 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 64aa348edc617dea17bbd01ddee4e47886d5ec8c< f6093ff67ea6e347574819ed23e96e0f82a25ffc affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2 affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< f56e54fd24f05e9de528fcb77f6084f80c8066ce affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< 5c3bff6cf26e6a54fbf8b893a879c32824d2d50d affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< b2113dcd8238bf00ce37a34e67b29cf31d32a545 affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< e7c69c6695d84220847cca62a45e879e71e79e9d affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< 9be10f49dfc2e4b472b3a5f346483b67374774b8 affected
64aa348edc617dea17bbd01ddee4e47886d5ec8c< 7577e00b9ab506202b9f1a33de3cc8cc6413a4db affected
… +10 more rows
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I. Basic Information for CVE-2026-93261

Vulnerability Information
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Vulnerability Title
locking/lockdep: Fix NULL pointer dereference in __lock_set_class()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: locking/lockdep: Fix NULL pointer dereference in __lock_set_class() register_lock_class() can return NULL when the lock class pool is exhausted, graph_lock() fails, or key validation fails. However, __lock_set_class() uses the return value directly in pointer arithmetic without a NULL check: class = register_lock_class(lock, subclass, 0); hlock->class_idx = class - lock_classes; If class is NULL, this computes a wild offset that corrupts hlock->class_idx. The subsequent reacquire_held_locks() call will invoke hlock_class() with this corrupted index, leading to a NULL or out-of-bounds pointer dereference. Add the missing NULL check, consistent with how __lock_acquire() already handles this case at the same call site.
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 64aa348edc617dea17bbd01ddee4e47886d5ec8c ~ f6093ff67ea6e347574819ed23e96e0f82a25ffc -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-93261

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III. Intelligence Information for CVE-2026-93261

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Patches & Fixes for CVE-2026-93261 (8)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93221 8.1 HIGH nfsd: convert nfsd_net boolean flags to unsigned long flags word
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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