- Vulnerability/
- CVE-2025-21981
CVE-2025-21981: ice: fix memory leak in aRFS after reset
First published: Tue Apr 01 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ice: fix memory leak in aRFS after reset Fix aRFS (accelerated Receive Flow Steering) structures memory leak by adding a checker to verify if aRFS memory is already allocated while configuring VSI. aRFS objects are allocated in two cases: - as part of VSI initialization (at probe), and - as part of reset handling However, VSI reconfiguration executed during reset involves memory allocation one more time, without prior releasing already allocated resources. This led to the memory leak with the following signature: [root@os-delivery ~]# cat /sys/kernel/debug/kmemleak unreferenced object 0xff3c1ca7252e6000 (size 8192): comm "kworker/0:0", pid 8, jiffies 4296833052 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 0): [<ffffffff991ec485>] __kmalloc_cache_noprof+0x275/0x340 [<ffffffffc0a6e06a>] ice_init_arfs+0x3a/0xe0 [ice] [<ffffffffc09f1027>] ice_vsi_cfg_def+0x607/0x850 [ice] [<ffffffffc09f244b>] ice_vsi_setup+0x5b/0x130 [ice] [<ffffffffc09c2131>] ice_init+0x1c1/0x460 [ice] [<ffffffffc09c64af>] ice_probe+0x2af/0x520 [ice] [<ffffffff994fbcd3>] local_pci_probe+0x43/0xa0 [<ffffffff98f07103>] work_for_cpu_fn+0x13/0x20 [<ffffffff98f0b6d9>] process_one_work+0x179/0x390 [<ffffffff98f0c1e9>] worker_thread+0x239/0x340 [<ffffffff98f14abc>] kthread+0xcc/0x100 [<ffffffff98e45a6d>] ret_from_fork+0x2d/0x50 [<ffffffff98e083ba>] ret_from_fork_asm+0x1a/0x30 ...
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Reference Links
- https://git.kernel.org/stable/c/fcbacc47d16306c87ad1b820b7a575f6e9eae58b
- https://git.kernel.org/stable/c/5d30d256661fc11b6e73fac6c3783a702e1006a3
- https://git.kernel.org/stable/c/3b27e6e10a32589fcd293b8933ab6de9387a460e
- https://git.kernel.org/stable/c/78f3d64b30210c0e521c59357431aca14024cb79
- https://git.kernel.org/stable/c/23d97f18901ef5e4e264e3b1777fe65c760186b5
Frequently Asked Questions
What is the severity of CVE-2025-21981?
CVE-2025-21981 is classified as a low-severity vulnerability affecting the Linux kernel.
How do I fix CVE-2025-21981?
To fix CVE-2025-21981, ensure that you update your Linux kernel to the latest version where the memory leak in aRFS is resolved.
What component of the Linux kernel is affected by CVE-2025-21981?
CVE-2025-21981 affects the aRFS (accelerated Receive Flow Steering) component of the Linux kernel.
Does CVE-2025-21981 cause any security risk?
CVE-2025-21981 primarily causes a memory leak which may lead to resource exhaustion, but does not directly pose a security threat.
What version of the Linux kernel is affected by CVE-2025-21981?
CVE-2025-21981 affects multiple versions of the Linux kernel prior to the fix being implemented.
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