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9.8
Linux Kernel: Potential TCP Connection Corruption
DEBIAN-CVE-2026-43198
Summary
A bug in the Linux kernel's TCP connection handling could cause unexpected behavior or crashes. This issue affects Linux systems and can be mitigated by updating the kernel to the latest version. Affected users should check for and apply any available kernel updates.
What to do
- Update debian linux to version 6.19.6-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Debian:11 | debian | linux | All versions |
| Debian:12 | debian | linux | All versions |
| Debian:13 | debian | linux | All versions |
| Debian:14 | debian | linux |
< 6.19.6-1 Fix: upgrade to 6.19.6-1
|
Original title
In the Linux kernel, the following vulnerability has been resolved: tcp: fix potential race in tcp_v6_syn_recv_sock() Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock() is do...
Original description
In the Linux kernel, the following vulnerability has been resolved: tcp: fix potential race in tcp_v6_syn_recv_sock() Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock() is done too late. After tcp_v4_syn_recv_sock(), the child socket is already visible from TCP ehash table and other cpus might use it. Since newinet->pinet6 is still pointing to the listener ipv6_pinfo bad things can happen as syzbot found. Move the problematic code in tcp_v6_mapped_child_init() and call this new helper from tcp_v4_syn_recv_sock() before the ehash insertion. This allows the removal of one tcp_sync_mss(), since tcp_v4_syn_recv_sock() will call it with the correct context.
osv CVSS3.1
9.8
- https://security-tracker.debian.org/tracker/CVE-2026-43198 Vendor Advisory
Published: 6 May 2026 · Updated: 9 May 2026 · First seen: 9 May 2026