CVE-2026-64438crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()
- 8.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() The VF2PF interrupt handler queues PF-side response work that stores a raw pointer to per-VF state (struct adf_accel_vf_info). Currently, adf_disable_sriov() destroys per-VF mutexes and frees vf_info without stopping new VF2PF work or waiting for in-flight workers to complete. A concurrently scheduled or already queued worker can then dereference freed memory. This manifests as a use-after-free when KASAN is enabled: BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0 Write of size 8 at addr 0000000000000260 by task kworker/24:2/... Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat] Call Trace: kasan_report+0x119/0x140 mutex_lock+0x76/0xe0 adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat] adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat] adf_iov_send_resp+0x8c/0xe0 [intel_qat] process_one_work+0x6ac/0xfd0 worker_thread+0x4dd/0xd30 kthread+0x326/0x410 ret_from_fork+0x33b/0x670 Add a PF-local flag, vf2pf_disabled, that gates work queueing, worker processing, and interrupt re-enabling during teardown. Set this flag atomically with the hardware interrupt mask inside adf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE cluster MSI-X interrupt and flush the PF response workqueue before tearing down per-VF locks and state so all in-flight work completes before vf_info is destroyed. Introduce adf_enable_all_vf2pf_interrupts() to clear the flag and unmask all VF2PF interrupts under the same lock when SR-IOV is re-enabled. This ensures the software flag and hardware state transition atomically on both the enable and disable paths.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 218c2836b3987f3fa1d9eac505462cded0821e4c
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 446b4d77599cf1a168573f7fb32a4a6aa4f09219
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 5d916c1eae1933511a69bffe243b4ee5d7da399c
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < f344a369d0380d54c8d6c8d24734a78dd5a89817
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 51144032248cc4ea22917370565650670b8b4e9b
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 49cd5ac6de8de39a14ead609bb552d372d5602cd
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 6e92b28cd74fa433658efeadf21b9d4b01023d7d
- affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 – < 277281c10c63791067d24d421f7c43a15faa9096
- affected 4.3
- unaffected < 4.3
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c (opens in a new tab)
- https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219 (opens in a new tab)
- https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c (opens in a new tab)
- https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817 (opens in a new tab)
- https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b (opens in a new tab)
- https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd (opens in a new tab)
- https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d (opens in a new tab)
- https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48782 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64438)Record last updated .