CVE-2025-21855

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Source
https://cve.org/CVERecord?id=CVE-2025-21855
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21855.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-21855
Downstream
Related
Published
2025-03-12T09:42:09Z
Modified
2026-08-12T03:51:34Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H CVSS Calculator
Summary
ibmvnic: Don't reference skb after sending to VIOS
Details

In the Linux kernel, the following vulnerability has been resolved:

ibmvnic: Don't reference skb after sending to VIOS

Previously, after successfully flushing the xmit buffer to VIOS, the tx_bytes stat was incremented by the length of the skb.

It is invalid to access the skb memory after sending the buffer to the VIOS because, at any point after sending, the VIOS can trigger an interrupt to free this memory. A race between reading skb->len and freeing the skb is possible (especially during LPM) and will result in use-after-free:

BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic] Read of size 4 at addr c00000024eb48a70 by task hxecom/14495 <...> Call Trace: [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable) [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0 [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8 [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0 [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic] [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358 <...> Freed by task 0: kasan_save_stack+0x34/0x68 kasan_save_track+0x2c/0x50 kasan_save_free_info+0x64/0x108 __kasan_mempool_poison_object+0x148/0x2d4 napi_skb_cache_put+0x5c/0x194 net_tx_action+0x154/0x5b8 handle_softirqs+0x20c/0x60c do_softirq_own_stack+0x6c/0x88 <...> The buggy address belongs to the object at c00000024eb48a00 which belongs to the cache skbuff_head_cache of size 224

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21855.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
032c5e82847a2214c3196a90f0aeba0ce252de58
Fixed
501ac6a7e21b82e05207c6b4449812d82820f306
Fixed
093b0e5c90592773863f300b908b741622eef597
Fixed
25dddd01dcc8ef3acff964dbb32eeb0d89f098e9
Fixed
abaff2717470e4b5b7c0c3a90e128b211a23da09
Fixed
bdf5d13aa05ec314d4385b31ac974d6c7e0997c9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21855.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.5.0
Fixed
6.1.130
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.80
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.17
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.13.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21855.json"