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Review reviewHigh

CVE-2025-21855

Linux Linux, linux kernel

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: ==============================================================...

CVSS
7.8
EPSS
0.40%
33.0% percentile
CISA KEV
Not listed
Published
2025.03.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.40%
Technical severityCVSS 7.8

Vulnerability overview

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: ==============================================================...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 032c5e82847a2214c3196a90f0aeba0ce252de58 < 501ac6a7e21b82e05207c6b4449812d82820f306, >= 032c5e82847a2214c3196a90f0aeba0ce252de58 < 093b0e5c90592773863f300b908b741622eef597, >= 032c5e82847a2214c3196a90f0aeba0ce252de58 < 25dddd01dcc8ef3acff964dbb32eeb0d89f098e9, >= 032c5e82847a2214c3196a90f0aeba0ce252de58 < abaff2717470e4b5b7c0c3a90e128b211a23da09, >= 032c5e82847a2214c3196a90f0aeba0ce252de58 < bdf5d13aa05ec314d4385b31ac974d6c7e0997c9, >= 4.5, >= 4.5 < 6.1.130, >= 6.2 < 6.6.80, >= 6.7 < 6.12.17, >= 6.13 < 6.13.5, 6.14
Fixed versions
6.1.130, 6.6.80, 6.12.17, 6.13.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2025-21855 — Linux Linux, linux kernel | SECUFOCUS NOW