CVE-2026-93094
wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback
Published Sep 17, 2026
CVSS n/a
EPSS < 1%
KEV · Not listed
Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback
ath12k_mac_vdev_create() for an AP vdev creates the bss self-peer via
ath12k_peer_create(), which finishes by calling
ath12k_dp_link_peer_assign() to publish the dp_link_peer in the
dp_hw->dp_peers[peerid_index] RCU table, in the dp_peer's
link_peers[] array, and in the per-addr rhashtable.
If a step after ath12k_peer_create() fails the function jumps to
err_peer_del, which open-codes a WMI peer_delete and waits for the
unmap / delete_resp events. The wait_for_peer_delete_done() path
relies on ath12k_dp_link_peer_unmap_event() freeing the dp_link_peer
when the unmap arrives, but err_peer_del never calls
ath12k_dp_link_peer_unassign() first. The published references in
the dp_hw RCU table, dp_peer->link_peers[] and the rhashtable are
left pointing at the dp_link_peer that unmap_event then frees,
producing dangling pointers and use-after-free on subsequent
lookups.
Replace the open-coded sequence with a call to ath12k_peer_delete(),
which already does ath12k_dp_link_peer_unassign() before sending the
WMI command. This drops the published references before the
dp_link_peer is freed, in the same order as the normal teardown path
in ath12k_mac_remove_link_interface().
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback
ath12k_mac_vdev_create() for an AP vdev creates the bss self-peer via
ath12k_peer_create(), which finishes by calling
ath12k_dp_link_peer_assign() to publish the dp_link_peer in the
dp_hw->dp_peers[peerid_index] RCU table, in the dp_peer's
link_peers[] array, and in the per-addr rhashtable.
If a step after ath12k_peer_create() fails the function jumps to
err_peer_del, which open-codes a WMI peer_delete and waits for the
unmap / delete_resp events. The wait_for_peer_delete_done() path
relies on ath12k_dp_link_peer_unmap_event() freeing the dp_link_peer
when the unmap arrives, but err_peer_del never calls
ath12k_dp_link_peer_unassign() first. The published references in
the dp_hw RCU table, dp_peer->link_peers[] and the rhashtable are
left pointing at the dp_link_peer that unmap_event then frees,
producing dangling pointers and use-after-free on subsequent
lookups.
Replace the open-coded sequence with a call to ath12k_peer_delete(),
which already does ath12k_dp_link_peer_unassign() before sending the
WMI command. This drops the published references before the
dp_link_peer is freed, in the same order as the normal teardown path
in ath12k_mac_remove_link_interface().
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
Affected Products
-
CVE record
-
NVD configurations
No data
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux Kernel |
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| Linux | Linux Kernel |
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Remediation
Tracking
Advisories
| Source | ID | Title |
|---|---|---|
 Ubuntu USN |
USN-9019-1 | Linux kernel (Azure) vulnerabilities |
| Ubuntu USN |
USN-9020-1 | Linux kernel vulnerabilities |
Metrics
No CVSS v4.0
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.198% probability within 30 days)
Key SSVC decision points have not yet been added.
References
History
Sep 19, 2026 9:30 AM
Weaknesses updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-415 |
Sep 17, 2026 4:30 PM
Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback ath12k_mac_vdev_create() for an AP vdev creates the bss self-peer via ath12k_peer_create(), which finishes by calling ath12k_dp_link_peer_assign() to publish the dp_link_peer in the dp_hw->dp_peers[peerid_index] RCU table, in the dp_peer's link_peers[] array, and in the per-addr rhashtable. If a step after ath12k_peer_create() fails the function jumps to err_peer_del, which open-codes a WMI peer_delete and waits for the unmap / delete_resp events. The wait_for_peer_delete_done() path relies on ath12k_dp_link_peer_unmap_event() freeing the dp_link_peer when the unmap arrives, but err_peer_del never calls ath12k_dp_link_peer_unassign() first. The published references in the dp_hw RCU table, dp_peer->link_peers[] and the rhashtable are left pointing at the dp_link_peer that unmap_event then frees, producing dangling pointers and use-after-free on subsequent lookups. Replace the open-coded sequence with a call to ath12k_peer_delete(), which already does ath12k_dp_link_peer_unassign() before sending the WMI command. This drops the published references before the dp_link_peer is freed, in the same order as the normal teardown path in ath12k_mac_remove_link_interface(). Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3 | |
| Title | wifi: ath12k: fix dp_link_peer dangling references on AP vdev rollback | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Subscriptions
Weaknesses
