CVE-2024-40931

Summary

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

mptcp: ensure snd_una is properly initialized on connect

This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after fallback and before processing any other incoming packet - so that snd_una is still left uninitialized.

Address the issue explicitly initializing snd_una together with snd_nxt and write_seq.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < 208cd22ef5e57f82d38ec11c1a1703f9401d6ddeaffected
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < 7b9c7fc8600b64a86e4b47b2d190bba380267726affected
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < f03c46eabb3a67bd2993e237ab5517f00a5f1813affected
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57faffected
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ceaffected
LinuxLinux8fd738049ac3d67a937d36577763b47180aae1ad < 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.221 <= 5.10.*unaffected
LinuxLinux5.15.162 <= 5.15.*unaffected
LinuxLinux6.1.95 <= 6.1.*unaffected
LinuxLinux6.6.35 <= 6.6.*unaffected
LinuxLinux6.9.6 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References