CVE-2024-41007

Summary

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

tcp: avoid too many retransmit packets

If a TCP socket is using TCP_USER_TIMEOUT, and the other peer retracted its window to zero, tcp_retransmit_timer() can retransmit a packet every two jiffies (2 ms for HZ=1000), for about 4 minutes after TCP_USER_TIMEOUT has 'expired'.

The fix is to make sure tcp_rtx_probe0_timed_out() takes icsk->icsk_user_timeout into account.

Before blamed commit, the socket would not timeout after icsk->icsk_user_timeout, but would use standard exponential backoff for the retransmits.

Also worth noting that before commit e89688e3e978 ("net: tcp: fix unexcepted socket die when snd_wnd is 0"), the issue would last 2 minutes instead of 4.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < 7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < d2346fca5bed130dc712f276ac63450201d52969affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < 5d7e64d70a11d988553a08239c810a658e841982affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < 04317a2471c2f637b4c49cbd0e9c0d04a519f570affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < e113cddefa27bbf5a79f72387b8fbd432a61a466affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < dfcdd7f89e401d2c6616be90c76c2fac3fa98fdeaffected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < 66cb64a1d2239cd0309f9b5038b05462570a5be1affected
LinuxLinuxb701a99e431db784714c32fc6b68123045714679 < 97a9063518f198ec0adb2ecb89789de342bb8283affected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux4.19.318 <= 4.19.*unaffected
LinuxLinux5.4.280 <= 5.4.*unaffected
LinuxLinux5.10.222 <= 5.10.*unaffected
LinuxLinux5.15.163 <= 5.15.*unaffected
LinuxLinux6.1.100 <= 6.1.*unaffected
LinuxLinux6.6.41 <= 6.6.*unaffected
LinuxLinux6.9.10 <= 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