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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570Patch
• https://git.kernel.org/stable/c/5d7e64d70a11d988553a08239c810a658e841982Patch
• https://git.kernel.org/stable/c/66cb64a1d2239cd0309f9b5038b05462570a5be1Patch
• https://git.kernel.org/stable/c/7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4Patch
• https://git.kernel.org/stable/c/97a9063518f198ec0adb2ecb89789de342bb8283Patch
• https://git.kernel.org/stable/c/d2346fca5bed130dc712f276ac63450201d52969Patch
• https://git.kernel.org/stable/c/dfcdd7f89e401d2c6616be90c76c2fac3fa98fdePatch
• https://git.kernel.org/stable/c/e113cddefa27bbf5a79f72387b8fbd432a61a466Patch