CVE-2025-21886
published 2025-03-27CVE-2025-21886: In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP hang on parent deregistration Fix the…
PriorityP418medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.19%
9.0th percentile
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix implicit ODP hang on parent deregistration
Fix the destroy_unused_implicit_child_mr() to prevent hanging during
parent deregistration as of below [1].
Upon entering destroy_unused_implicit_child_mr(), the reference count
for the implicit MR parent is incremented using:
refcount_inc_not_zero().
A corresponding decrement must be performed if
free_implicit_child_mr_work() is not called.
The code has been updated to properly manage the reference count that
was incremented.
[1]
INFO: task python3:2157 blocked for more than 120 seconds.
Not tainted 6.12.0-rc7+ #1633
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:python3 state:D stack:0 pid:2157 tgid:2157 ppid:1685 flags:0x00000000
Call Trace:
__schedule+0x420/0xd30
schedule+0x47/0x130
__mlx5_ib_dereg_mr+0x379/0x5d0 [mlx5_ib]
? __pfx_autoremove_wake_function+0x10/0x10
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+0xc1/0x2f0
? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]
? ib_uverbs_ioctl+0x116/0x170 [ib_uverbs]
? lock_release+0xc6/0x280
ib_uverbs_ioctl+0xe7/0x170 [ib_uverbs]
? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]
__x64_sys_ioctl+0x1b0/0xa70
? kmem_cache_free+0x221/0x400
do_syscall_64+0x6b/0x140
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f20f21f017b
RSP: 002b:00007ffcfc4a77c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffcfc4a78d8 RCX: 00007f20f21f017b
RDX: 00007ffcfc4a78c0 RSI: 00000000c0181b01 RDI: 0000000000000003
RBP: 00007ffcfc4a78a0 R08: 000056147d125190 R09: 00007f20f1f14c60
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffcfc4a7890
R13: 000000000000001c R14: 000056147d100fc0 R15: 00007f20e365c9d0
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.12.19-1 (forky) | linux 6.12.19-1 (forky) |
| linux | linux | >= 6.12.13 < 6.12.18 | 6.12.18 |
| linux | linux | >= 6.13.2 < 6.13.6 | 6.13.6 |
| linux | linux | >= 7cc8f681f6d4ae4478ae0f60485fc768f2b450da < cb96ae783e7249e8e5a50c22952c0bb2983133df | cb96ae783e7249e8e5a50c22952c0bb2983133df |
| linux | linux | >= d3d930411ce390e532470194296658a960887773 < 3d8c6f26893d55fab218ad086719de1fc9bb86ba | 3d8c6f26893d55fab218ad086719de1fc9bb86ba |
| linux | linux | >= edfb65dbb9ffd3102f3ff4dd21316158e56f1976 < a095ede2daca49d15e74d66d014883f2fa8bb924 | a095ede2daca49d15e74d66d014883f2fa8bb924 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.12.19-1 | 6.12.19-1 |
| linux | linux_kernel | >= 0 < 6.12.19-1 | 6.12.19-1 |
| linux | linux_kernel | >= 6.12.13 < 6.12.18 | 6.12.18 |
| linux | linux_kernel | >= 6.13.2 < 6.13.6 | 6.13.6 |
| msrc | cbl2_xorg-x11-server_1.20.10-12_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_xorg-x11-server_1.20.10-15_on_cbl_mariner_2.0 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_msrc7.8HIGH
vendor_debian5.5LOW
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-4q32-287f-wf74: In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix implicit ODP hang on parent deregistration
Fix the destroy_unused
ghsa_unreviewed·2025-03-27
CVE-2025-21886 [MEDIUM] GHSA-4q32-287f-wf74: In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix implicit ODP hang on parent deregistration
Fix the destroy_unused
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix implicit ODP hang on parent deregistration
Fix the destroy_unused_implicit_child_mr() to prevent hanging during
parent deregistration as of below [1].
Upon entering destroy_unused_implicit_child_mr(), the reference count
for the implicit MR parent is incremented using:
refcount_inc_not_zero().
A corresponding decrement must be performed if
free_implicit_child_mr_work() is not called.
The code has been updated to properly manage the reference count that
was incremented.
[1]
INFO: task python3:2157 blocked for more than 120 seconds.
Not tainted 6.12.0-rc7+ #1633
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:python3 state:D stack:0 pid:2157 tgid:2157 ppid:1685 flags:0x0000
OSV
CVE-2025-21886: In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP hang on parent deregistration Fix the destroy_unused_i
osv·2025-03-27·CVSS 5.5
CVE-2025-21886 [MEDIUM] CVE-2025-21886: In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP hang on parent deregistration Fix the destroy_unused_i
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP hang on parent deregistration Fix the destroy_unused_implicit_child_mr() to prevent hanging during parent deregistration as of below [1]. Upon entering destroy_unused_implicit_child_mr(), the reference count for the implicit MR parent is incremented using: refcount_inc_not_zero(). A corresponding decrement must be performed if free_implicit_child_mr_work() is not called. The code has been updated to properly manage the reference count that was incremented. [1] INFO: task python3:2157 blocked for more than 120 seconds. Not tainted 6.12.0-rc7+ #1633 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:python3 state:D stack:0 pid:2157 tgid:2157 ppid:1685 flags:0x00000000 C
Red Hat
kernel: RDMA/mlx5: Fix implicit ODP hang on parent deregistration
vendor_redhat·2025-03-27·CVSS 5.5
CVE-2025-21886 [MEDIUM] CWE-99 kernel: RDMA/mlx5: Fix implicit ODP hang on parent deregistration
kernel: RDMA/mlx5: Fix implicit ODP hang on parent deregistration
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix implicit ODP hang on parent deregistration
Fix the destroy_unused_implicit_child_mr() to prevent hanging during
parent deregistration as of below [1].
Upon entering destroy_unused_implicit_child_mr(), the reference count
for the implicit MR parent is incremented using:
refcount_inc_not_zero().
A corresponding decrement must be performed if
free_implicit_child_mr_work() is not called.
The code has been updated to properly manage the reference count that
was incremented.
[1]
INFO: task python3:2157 blocked for more than 120 seconds.
Not tainted 6.12.0-rc7+ #1633
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:pyth
Debian
CVE-2025-21886: linux - In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: ...
vendor_debian·2025·CVSS 5.5
CVE-2025-21886 [MEDIUM] CVE-2025-21886: linux - In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: ...
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP hang on parent deregistration Fix the destroy_unused_implicit_child_mr() to prevent hanging during parent deregistration as of below [1]. Upon entering destroy_unused_implicit_child_mr(), the reference count for the implicit MR parent is incremented using: refcount_inc_not_zero(). A corresponding decrement must be performed if free_implicit_child_mr_work() is not called. The code has been updated to properly manage the reference count that was incremented. [1] INFO: task python3:2157 blocked for more than 120 seconds. Not tainted 6.12.0-rc7+ #1633 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:python3 state:D stack:0 pid:2157 tgid:2157 ppid:1685 flags:0x00000000 C
Microsoft
Xorg-x11-server: heap buffer overflow in disabledevice
vendor_msrc·2024-02-13·CVSS 7.8
CVE-2024-21886 [HIGH] CWE-122 Xorg-x11-server: heap buffer overflow in disabledevice
Xorg-x11-server: heap buffer overflow in disabledevice
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://lear
No detection rules found.
No public exploits indexed.
2025-03-27
Published