EUVD-2026-38877
GHSA-67p5-53x6-9j7q
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local only, requires a rare offload-failure race plus admin-driven interface teardown (AC:H/PR:H); realistic impact is a crash (A:H) with no demonstrated confidentiality/integrity loss.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
ice: fix double-free of tx_buf skb
If ice_tso() or ice_tx_csum() fail, the error path in ice_xmit_frame_ring() frees the skb, but the 'first' tx_buf still points to it and is marked as valid (ICE_TX_BUF_SKB). 'next_to_use' remains unchanged, so the potential problem will likely fix itself when the next packet is transmitted and the tx_buf gets overwritten. But if there is no next packet and the interface is brought down instead, ice_clean_tx_ring() -> ice_unmap_and_free_tx_buf() will find the tx_buf and free the skb for the second time.
The fix is to reset the tx_buf type to ICE_TX_BUF_EMPTY in the error path, so that ice_unmap_and_free_tx_buf(). Move the initialization of 'first' up, to ensure it's already valid in case we hit the linearization error path.
The bug was spotted by AI while I had it looking for something else. It also proposed an initial version of the patch.
I reproduced the bug and tested the fix by adding code to inject failures, on a build with KASAN.
I looked for similar bugs in related Intel drivers and did not find any.
AnalysisAI
Local privilege-impacting memory corruption in the Linux kernel's Intel ice network driver allows a double-free of a transmit buffer's skb when the TX offload paths fail. When ice_tso() or ice_tx_csum() return an error, ice_xmit_frame_ring() frees the skb but leaves the 'first' tx_buf still marked ICE_TX_BUF_SKB, so a later ice_clean_tx_ring() during interface teardown frees the same skb a second time. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that an Intel E800-series NIC using the ice driver is present and active, and that ice_tso() or ice_tx_csum() fails in ice_xmit_frame_ring() (an uncommon TX offload error path), leaving the freed skb's tx_buf still marked ICE_TX_BUF_SKB. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals point to a genuine but low-priority bug for most environments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user or workload capable of driving the TX path and influencing interface state induces an offload failure (e.g. via crafted TSO/checksum conditions) so the skb is freed once, then causes or waits for the ice interface to be brought down, triggering ice_clean_tx_ring() to free the same skb again and corrupt kernel heap state, typically crashing the host. … |
| Remediation | Apply the upstream kernel fix, which resets the tx_buf type to ICE_TX_BUF_EMPTY in the TX error path and moves initialization of 'first' earlier so it is valid on the linearization error path; the fix is delivered via the stable-tree commits https://git.kernel.org/stable/c/4c08fc2119ef0281cfa2cee007acf0a251be55f2 and https://git.kernel.org/stable/c/1a303baa715e6b78d6a406aaf335f87ff35acfcd. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Linux systems using the Intel ice network driver (verify via 'lspci | grep -i ice' and ethtool driver confirmation). …
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