CVE-2026-97506
UnknownSummary
In the Linux kernel, the crypto ixp4xx driver has a vulnerability to NULL pointer dereference during buffer chain allocation. On allocation failure, the code sets buf to NULL and later dereferences it unconditionally, which can lead to a system crash. Additionally, the partially built chain is not properly released.
Risk Assessment
An attacker could cause a system crash (kernel panic) by triggering an allocation failure, leading to denial of service.
Recommendation
Apply the patch from a newer Linux kernel version that fixes the NULL dereference and proper chain unwinding.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: crypto: ixp4xx - fix buffer chain unwind on allocation failure chainup_buffers() builds a linked list of buffer descriptors for a scatterlist. If dma_pool_alloc() fails while constructing the list, the current code sets buf to NULL and later dereferences it unconditionally at the end of the function: buf->next = NULL; buf->phys_next = 0; This can lead to a null-pointer dereference on allocation failure. If the failure happens after part of the descriptor chain has already been allocated and DMA-mapped, the partially constructed chain also needs to be released. Fix this by terminating the partially constructed chain on allocation failure and letting the callers unwind it via their existing cleanup paths. Also fix ablk_perform() to preserve the hook pointers before checking for failure, so partially built chains can be freed correctly.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS