CVE-2024-44932: idpf: fix UAFs when destroying the queues
In the Linux kernel, the following vulnerability has been resolved:
idpf: fix UAFs when destroying the queues
The second tagged commit started sometimes (very rarely, but possible)
throwing WARNs from
net/core/page_pool.c:page_pool_disable_direct_recycling().
Turned out idpf frees interrupt vectors with embedded NAPIs *before*
freeing the queues making page_pools' NAPI pointers lead to freed
memory before these pools are destroyed by libeth.
It's not clear whether there are other accesses to the freed vectors
when destroying the queues, but anyway, we usually free queue/interrupt
vectors only when the queues are destroyed and the NAPIs are guaranteed
to not be referenced anywhere.
Invert the allocation and freeing logic making queue/interrupt vectors
be allocated first and freed last. Vectors don't require queues to be
present, so this is safe. Additionally, this change allows to remove
that useless queue->q_vector pointer cleanup, as vectors are still
valid when freeing the queues (+ both are freed within one function,
so it's not clear why nullify the pointers at all).
Security readout for executives and security teams
Plain-English summary
CVE-2024-44932 is a Linux kernel memory safety bug in the idpf network driver. During queue teardown, interrupt vectors containing NAPI state could be freed before related queues, leaving stale pointers. The public data does not show active exploitation, CVSS, or a vendor workaround beyond the kernel fix references.
Executive priority
Treat this as a targeted kernel maintenance item, not an internet-wide emergency based on available evidence. Prioritize systems using the idpf driver because kernel use-after-free bugs can affect reliability and may carry security risk even when exploitability is not proven.
Technical view
The issue is a use-after-free during idpf queue destruction. Page-pool NAPI pointers could reference freed interrupt-vector memory because vectors were released before queues. The fix inverts allocation/free ordering so queue/interrupt vectors are allocated first and freed last, keeping NAPI references valid during teardown.
Likely exposure
Exposure appears limited to Linux systems running affected kernels with the idpf driver in use. The source bundle names Linux 6.7, 6.10.5, and 6.11-related version data, but distribution backport status must be verified with the OS vendor.
Exploitation context
The source describes rare WARNs during queue destruction and identifies use-after-free conditions. It does not provide evidence of exploitation, public exploit availability, KEV listing, privilege requirements, or remotely reachable attack conditions.
Researcher notes
Evidence is limited to the kernel CVE description and stable commit references. The key condition is teardown ordering between idpf queues, interrupt vectors, NAPI pointers, and page_pool cleanup. No CVSS, CWE, exploit status, or complete affected distribution matrix is provided.
Mitigation direction
Check OS vendor advisories for CVE-2024-44932 and idpf driver fixes.
Upgrade to a vendor kernel containing the referenced stable fixes.
Prioritize hosts using idpf-supported network hardware or virtual functions.
If patching is delayed, review vendor guidance for driver-specific mitigations.
Validation and detection
Inventory running kernel versions and whether the idpf module is loaded.
Confirm vendor kernel changelog includes CVE-2024-44932 or the referenced stable commits.
Review kernel logs for idpf, NAPI, page_pool, or queue teardown warnings.
Validate patched systems after reboot into the updated kernel.
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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