CVE-2021-46973

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: qrtr: Avoid potential use after free in MHI send

It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb.

As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 48ec949ac979b4b42d740f67b6177797af834f80affected
LinuxLinux6e728f321393b1fce9e1c2c3e55f9f7c15991321 < ea474054c2cc6e1284604b21361f475c7cc8c0a0affected
LinuxLinux6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 03c649dee8b1eb5600212a249542a70f47a5ab40affected
LinuxLinux6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 47a017f33943278570c072bc71681809b2567b3aaffected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.35 <= 5.10.*unaffected
LinuxLinux5.11.19 <= 5.11.*unaffected
LinuxLinux5.12.2 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

CVE Program Container

Additional References

References