netfilter: conntrack: remove sprintf usage

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: remove sprintf usage Replace it with scnprintf, the buffer sizes are expected to be large enough to hold the result, no need for snprintf+overflow check. Increase buffer size in mangle_content_len() while at it. BUG: KASAN: stack-out-of-bounds in vsnprintf+0xea5/0x1270 Write of size 1 at addr [..] vsnprintf+0xea5/0x1270 sprintf+0xb1/0xe0 mangle_content_len+0x1ac/0x280 nf_nat_sdp_session+0x1cc/0x240 process_sdp+0x8f8/0xb80 process_invite_request+0x108/0x2b0 process_sip_msg+0x5da/0xf50 sip_help_tcp+0x45e/0x780 nf_confirm+0x34d/0x990 [..]

Timeline

1. Jun 24, 2026, 4:29 PM UTCCVE published
2. Oct 16, 2026, 3:24 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Oct 19, 2026, 7:47 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in 2f793ba78470a99f40389b7dc60a81d9f5ad3956; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in 6bbf829b4c1b44c941c47dd0d710f1393258f3d5; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in ab64e61c9323fa6de21bd20da1ddb29a0fb65d34; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in a8e0a32a23d3f34862af3b4da792ecb3a891a9a3; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in 8e3be0d12615a173fe260cd42753ca7a001acbf2; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in c08ff52e44945e6ef4ce0790f49ea761b060c45b; From 9fafcd7b203229c3f3893a475741afc27e276306 · fixed in 6e7066bdb481a87fe88c4fa563e348c03b2d373d

• Linux Linux

  2.6.20

• KernelLinux

  From 2.6.20 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.141; From 6.7.0 · fixed in 6.12.91; From 6.13.0 · fixed in 6.18.33; From 6.19.0 · fixed in 7.0.10

References 8