Bug 2513413 (CVE-2026-68327)

Summary: CVE-2026-68327 kernel: wan: wanxl: Only reset hardware after BAR mapping
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `wanxl` driver. During the initialization process, an error handling path in the `wanxl_pci_remove_one()` function can lead to a null pointer dereference. This occurs when the `wanxl_reset()` function attempts to access hardware resources before they are properly mapped, specifically the `card->plx` pointer, if an early probe failure happens. A local attacker could potentially trigger this condition, leading to a system crash and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-10 12:35:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wan: wanxl: Only reset hardware after BAR mapping

wanxl_pci_init_one() stores the freshly allocated card in driver data
before the PLX BAR is mapped.  Several early probe failures then unwind
through wanxl_pci_remove_one(), including failure to allocate the coherent
status area or to restore the DMA mask.

wanxl_pci_remove_one() unconditionally calls wanxl_reset(), and
wanxl_reset() dereferences card->plx.  On those early failures card->plx
is still NULL, so the error path can dereference a NULL MMIO pointer.

Only issue the hardware reset once the BAR mapping exists.  The remaining
cleanup in wanxl_pci_remove_one() already checks whether later resources
were allocated.

This issue was found by a static analysis checker and confirmed by
manual source review.
Comment 1 gkamathe 2026-08-11 15:13:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081034-CVE-2026-68327-f232@gregkh/T