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CVE-2026-74395— RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于RDMA/mlx5的devx subscribe-event unwind路径中event_sub字段未初始化即被链接，若eventfd_ctx_fdget()失败，可能导致空指针解引用。

AI Predicted 5.5 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7597385371425febdaa8c6a1da3625d4ffff16f5< 6e15b770461eeaa0ff73934922cb670a6a9db04e affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 9be9aca28424228586fe9211c373ebdb826ebb6c affected
7597385371425febdaa8c6a1da3625d4ffff16f5< f345e744b6b087188cde2377da5cbe9713b61353 affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 1025dc2f7ba29b04b8687790fa91f9cd1a53141e affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 7921821fc2b19c01588311f6e7468ae5b68b1f61 affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 78b9589fda266c71f0f9d0c858d4fa7381a890a5 affected
7597385371425febdaa8c6a1da3625d4ffff16f5< 43f8f7946814c8e5f464518246fdbc69b6e32326 affected
… +10 more rows
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I. Basic Information for CVE-2026-74395

Vulnerability Information
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Vulnerability Title
RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list before initializing the fields used by the shared error path. If eventfd_ctx_fdget() then fails, the unwind path dereferences event_sub->ev_file in uverbs_uobject_put() and calls subscribe_event_xa_dealloc() with an unset xa_key_level1. subscribe_event_xa_alloc() creates the XA entry exactly once for a given key_level1, on the first occurrence of that key. The unwind path must therefore call subscribe_event_xa_dealloc() exactly once for it as well. Enforce that by adding devx_key_in_sub_list() and calling subscribe_event_xa_dealloc() only when the last matching pending entry is being cleaned up.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于RDMA/mlx5的devx subscribe-event unwind路径中event_sub字段未初始化即被链接，若eventfd_ctx_fdget()失败，可能导致空指针解引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7597385371425febdaa8c6a1da3625d4ffff16f5 ~ 6e15b770461eeaa0ff73934922cb670a6a9db04e -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-74395

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III. Intelligence Information for CVE-2026-74395

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Patches & Fixes for CVE-2026-74395 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74473 9.8 CRITICAL vxlan: use pskb_network_may_pull() in route_shortcircuit()
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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