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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 650af68435eaee783824457d2ef78cc5c03c1e88affectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 350fd3125ee26b5243935fd9e2b4d162ffba430aaffectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7affectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 298659c3677bf622afa9d77549cb4a967f9541e9affectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 02eba5f36d20283f144f75d47f0354a85e4f78f0affectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 7e98216e9da08b79e07a514d2a4f7646f8c9ccb9affectedaa730a9905b7b079ef2fffdab7f15dbb842f5c7c to < 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7affected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.54 to ≤ 6.18.*unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/650af68435eaee783824457d2ef78cc5c03c1e88 ↗
- https://git.kernel.org/stable/c/350fd3125ee26b5243935fd9e2b4d162ffba430a ↗
- https://git.kernel.org/stable/c/dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7 ↗
- https://git.kernel.org/stable/c/298659c3677bf622afa9d77549cb4a967f9541e9 ↗
- https://git.kernel.org/stable/c/02eba5f36d20283f144f75d47f0354a85e4f78f0 ↗
- https://git.kernel.org/stable/c/7e98216e9da08b79e07a514d2a4f7646f8c9ccb9 ↗
- https://git.kernel.org/stable/c/31550d585589fde1ae95bf7f7a8188b2d2fdf1c7 ↗