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CVE-2026-98236

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in650af68435eaee783824457d2ef78cc5c03c1e88Also 350fd3125ee26b5243935fd9e2b4d162ffba430a, 298659c3677bf622afa9d77549cb4a967f9541e9 and 3 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 650af68435eaee783824457d2ef78cc5c03c1e88LinuxCVE List
  • 350fd3125ee26b5243935fd9e2b4d162ffba430aLinuxCVE List
  • 298659c3677bf622afa9d77549cb4a967f9541e9LinuxCVE List
  • 02eba5f36d20283f144f75d47f0354a85e4f78f0LinuxCVE List
  • 7e98216e9da08b79e07a514d2a4f7646f8c9ccb9LinuxCVE List
  • 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In 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.

Text from CVE List

Affected versions 16

  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 650af68435eaee783824457d2ef78cc5c03c1e88CVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 350fd3125ee26b5243935fd9e2b4d162ffba430aCVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7CVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 298659c3677bf622afa9d77549cb4a967f9541e9CVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 02eba5f36d20283f144f75d47f0354a85e4f78f0CVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 7e98216e9da08b79e07a514d2a4f7646f8c9ccb9CVE List
  • Linuxaffected: aa730a9905b7b079ef2fffdab7f15dbb842f5c7c before 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7CVE List
  • Linuxaffected: 5.15CVE List
  • Linuxunaffected: all versions before 5.15CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 7