net: wwan: mhi_wwan_mbim: check skb_copy_bits() return value

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98236
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:11 UTC
Updated2026-10-06 09:18:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: wwan: mhi_wwan_mbim: check skb_copy_bits() return value mhi_mbim_rx() ignores the return value of skb_copy_bits() when it copies each datagram out of the NTB. The datagram offset and length come from the DPE, which is only checked to lie within the NTB itself, so a modem can point a datagram outside the received skb. The copy then fails and the freshly allocated skbn is passed to netif_rx() with its uninitialized contents still in place, leaking kernel heap memory into the network stack. Free the skb and account an error when the copy fails. Verified in a QEMU guest with a fault injector pointing a DPE outside the received NTB: the copy fails, and the unpatched driver hands the uninitialized skbn to the network stack (observed as "unknown protocol" on bytes that were never written). With this check the failed datagram is dropped and counted as an rx error. Changes in v2: factor the free-and-count sequence out into mhi_mbim_rx_drop(), shared with the unknown-protocol path, as suggested by Loic Poulain.

Risk And Classification

EPSS: 0.001800000 probability, percentile 0.069190000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 650af68435eaee783824457d2ef78cc5c03c1e88 git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 350fd3125ee26b5243935fd9e2b4d162ffba430a git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7 git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 298659c3677bf622afa9d77549cb4a967f9541e9 git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 02eba5f36d20283f144f75d47f0354a85e4f78f0 git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 7e98216e9da08b79e07a514d2a4f7646f8c9ccb9 git Not specified
CNA Linux Linux affected aa730a9905b7b079ef2fffdab7f15dbb842f5c7c 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/350fd3125ee26b5243935fd9e2b4d162ffba430a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/02eba5f36d20283f144f75d47f0354a85e4f78f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/31550d585589fde1ae95bf7f7a8188b2d2fdf1c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/650af68435eaee783824457d2ef78cc5c03c1e88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e98216e9da08b79e07a514d2a4f7646f8c9ccb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/298659c3677bf622afa9d77549cb4a967f9541e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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