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CVE-2025-21892— RDMA/mlx5: Fix the recovery flow of the UMR QP

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mlx5未正确处理UMR QP恢复流程，可能导致任务挂起。

AI Predicted 5.5 Difficulty: Easy EPSS 0.14% · P3 Updated Oct 21, 2026

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2< 6088e11c9aed12ecc8df465bdd334e60b75999a9`	affected
		`158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2< 3e3bf255992cc02404e9d209b127c1c9944239cf`	affected
		`158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2< 1d2b84d8d054313deed2b2fcafe1168bbcb9e99f`	affected
		`158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2< d97505baea64d93538b16baf14ce7b8c1fbad746`	affected
		`d8f7bff9a42627d37f4ecffeb01e44db42167175`	affected
		`5.19.10< 5.20`	affected
		`6.0`	affected
		`< 6.0`	unaffected
… +4 more rows

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I. Basic Information for CVE-2025-21892

Vulnerability Information

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Vulnerability Title

RDMA/mlx5: Fix the recovery flow of the UMR QP

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix the recovery flow of the UMR QP This patch addresses an issue in the recovery flow of the UMR QP, ensuring tasks do not get stuck, as highlighted by the call trace [1]. During recovery, before transitioning the QP to the RESET state, the software must wait for all outstanding WRs to complete. Failing to do so can cause the firmware to skip sending some flushed CQEs with errors and simply discard them upon the RESET, as per the IB specification. This race condition can result in lost CQEs and tasks becoming stuck. To resolve this, the patch sends a final WR which serves only as a barrier before moving the QP state to RESET. Once a CQE is received for that final WR, it guarantees that no outstanding WRs remain, making it safe to transition the QP to RESET and subsequently back to RTS, restoring proper functionality. Note: For the barrier WR, we simply reuse the failed and ready WR. Since the QP is in an error state, it will only receive IB_WC_WR_FLUSH_ERR. However, as it serves only as a barrier we don't care about its status. [1] INFO: task rdma_resource_l:1922 blocked for more than 120 seconds. Tainted: G W 6.12.0-rc7+ #1626 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:rdma_resource_l state:D stack:0 pid:1922 tgid:1922 ppid:1369 flags:0x00004004 Call Trace: <TASK> __schedule+0x420/0xd30 schedule+0x47/0x130 schedule_timeout+0x280/0x300 ? mark_held_locks+0x48/0x80 ? lockdep_hardirqs_on_prepare+0xe5/0x1a0 wait_for_completion+0x75/0x130 mlx5r_umr_post_send_wait+0x3c2/0x5b0 [mlx5_ib] ? __pfx_mlx5r_umr_done+0x10/0x10 [mlx5_ib] mlx5r_umr_revoke_mr+0x93/0xc0 [mlx5_ib] __mlx5_ib_dereg_mr+0x299/0x520 [mlx5_ib] ? _raw_spin_unlock_irq+0x24/0x40 ? wait_for_completion+0xfe/0x130 ? rdma_restrack_put+0x63/0xe0 [ib_core] ib_dereg_mr_user+0x5f/0x120 [ib_core] ? lock_release+0xc6/0x280 destroy_hw_idr_uobject+0x1d/0x60 [ib_uverbs] uverbs_destroy_uobject+0x58/0x1d0 [ib_uverbs] uobj_destroy+0x3f/0x70 [ib_uverbs] ib_uverbs_cmd_verbs+0x3e4/0xbb0 [ib_uverbs] ? __pfx_uverbs_destroy_def_handler+0x10/0x10 [ib_uverbs] ? __lock_acquire+0x64e/0x2080 ? mark_held_locks+0x48/0x80 ? find_held_lock+0x2d/0xa0 ? lock_acquire+0xc1/0x2f0 ? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs] ? __fget_files+0xc3/0x1b0 ib_uverbs_ioctl+0xe7/0x170 [ib_uverbs] ? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs] __x64_sys_ioctl+0x1b0/0xa70 do_syscall_64+0x6b/0x140 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f99c918b17b RSP: 002b:00007ffc766d0468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffc766d0578 RCX: 00007f99c918b17b RDX: 00007ffc766d0560 RSI: 00000000c0181b01 RDI: 0000000000000003 RBP: 00007ffc766d0540 R08: 00007f99c8f99010 R09: 000000000000bd7e R10: 00007f99c94c1c70 R11: 0000000000000246 R12: 00007ffc766d0530 R13: 000000000000001c R14: 0000000040246a80 R15: 0000000000000000 </TASK>

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mlx5未正确处理UMR QP恢复流程，可能导致任务挂起。

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	158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 ~ 6088e11c9aed12ecc8df465bdd334e60b75999a9	-
Linux	Linux	6.0	-

II. Public POCs for CVE-2025-21892

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2025-21892

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Patches & Fixes for CVE-2025-21892 (4)

https://www.cve.org/CVERecord?id=CVE-2025-21892

Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

CVE-2023-53006	9.8 CRITICAL	cifs: Fix oops due to uncleared server->smbd_conn in reconnect
CVE-2025-21876	8.8 HIGH	iommu/vt-d: Fix suspicious RCU usage
CVE-2025-21890	8.2 HIGH	idpf: fix checksums set in idpf_rx_rsc()
CVE-2025-21887	7.8 HIGH	ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
CVE-2023-53033	7.8 HIGH	netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
CVE-2025-21889	7.8 HIGH	perf/core: Add RCU read lock protection to perf_iterate_ctx()
CVE-2023-52930	7.8 HIGH	drm/i915: Fix potential bit_17 double-free
CVE-2023-52931	7.8 HIGH	drm/i915: Avoid potential vm use-after-free
CVE-2023-52934	7.8 HIGH	mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups
CVE-2023-52935	7.8 HIGH	mm/khugepaged: fix ->anon_vma race
CVE-2023-53009	7.8 HIGH	drm/amdkfd: Add sync after creating vram bo
CVE-2023-52999	7.8 HIGH	net: fix UaF in netns ops registration error path
CVE-2023-52973	7.8 HIGH	vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
CVE-2023-52983	7.8 HIGH	block, bfq: fix uaf for bfqq in bic_set_bfqq()
CVE-2023-52981	7.8 HIGH	drm/i915: Fix request ref counting during error capture & debugfs dump
CVE-2023-52975	7.8 HIGH	scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress
CVE-2023-52974	7.8 HIGH	scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress
CVE-2022-49760	7.8 HIGH	mm/hugetlb: fix PTE marker handling in hugetlb_change_protection()
CVE-2025-21867	7.8 HIGH	bpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()
CVE-2023-52988	7.8 HIGH	ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()

Showing top 20 of 124 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux