CVE-2025-38292: wifi: ath12k: fix invalid access to memory
In the Linux kernel, the following vulnerability has been resolved:
wifi: ath12k: fix invalid access to memory
In ath12k_dp_rx_msdu_coalesce(), rxcb is fetched from skb and boolean
is_continuation is part of rxcb.
Currently, after freeing the skb, the rxcb->is_continuation accessed
again which is wrong since the memory is already freed.
This might lead use-after-free error.
Hence, fix by locally defining bool is_continuation from rxcb,
so that after freeing skb, is_continuation can be used.
Compile tested only.
Security readout for executives and security teams
Plain-English summary
A Linux Wi-Fi driver may read memory after it has been freed while processing received data. The supplied CVSS score is 8.8, indicating potentially severe confidentiality, integrity, and availability impact. Exposure is limited to systems using the affected ath12k driver and vulnerable kernel code.
Executive priority
Treat this as a high-priority kernel maintenance issue for ath12k-equipped devices. Accelerate inventory and vendor-supported updates where wireless proximity is plausible. Emergency incident handling is not justified by the supplied evidence alone because active exploitation and demonstrated real-world impact are not documented.
Technical view
ath12k_dp_rx_msdu_coalesce() retrieves rxcb from an skb, frees that skb, then accesses rxcb->is_continuation. The stable fix copies the Boolean value before freeing the skb, preventing the possible use-after-free. The source states the change was compile-tested only.
Likely exposure
Prioritize Linux devices using the ath12k wireless driver, particularly those within adjacent wireless reach. The bundle lists versions including 6.3, 6.12.34, 6.15.3, and 6.16, but its flattened version data does not establish reliable affected or fixed ranges. Confirm status with the kernel distributor.
Exploitation context
The CVSS vector describes an adjacent-network, low-complexity condition requiring no privileges or user interaction. However, the bundle provides no evidence of public exploitation or a working exploit, and the CVE is not listed as KEV. The description says the flaw might cause a use-after-free; it does not document demonstrated impact.
Researcher notes
The defect is a narrowly described lifetime error involving skb-derived rxcb state. Three stable-kernel commits are cited as fixes. Exact vulnerable version boundaries are unclear in the supplied normalized data, and no CWE is assigned. Assess backports by commit inclusion rather than version-number assumptions.
Mitigation direction
Update to a vendor-supported kernel containing the applicable cited stable fix.
Check Linux distributor guidance for precise affected and corrected package versions.
Prioritize ath12k-enabled systems reachable through untrusted or shared wireless environments.
Test the update carefully because the submitted fix was compile-tested only.
Validation and detection
Inventory systems that load or depend upon the ath12k wireless driver.
Map installed kernel packages against distributor advisories and supported release metadata.
Confirm the deployed kernel incorporates the applicable cited stable commit.
After updating, test ath12k connectivity and monitor for kernel memory errors or crashes.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
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4Source links
CVSS vector scores
1 official score
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