CVE-2026-53002 PUBLISHED

netfilter: conntrack: remove sprintf usage

Assigner: Linux
Reserved: 09.06.2026 Published: 24.06.2026 Updated: 28.06.2026

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 [..]

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to 2f793ba78470a99f40389b7dc60a81d9f5ad3956 (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to 8e3be0d12615a173fe260cd42753ca7a001acbf2 (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to c08ff52e44945e6ef4ce0790f49ea761b060c45b (excl.)
  • affected from 9fafcd7b203229c3f3893a475741afc27e276306 to 6e7066bdb481a87fe88c4fa563e348c03b2d373d (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.20 is affected
  • unaffected from 0 to 2.6.20 (excl.)
  • unaffected from 5.10.258 to 5.10.* (incl.)
  • unaffected from 5.15.209 to 5.15.* (incl.)
  • unaffected from 6.1.175 to 6.1.* (incl.)
  • unaffected from 6.6.141 to 6.6.* (incl.)
  • unaffected from 6.12.91 to 6.12.* (incl.)
  • unaffected from 6.18.33 to 6.18.* (incl.)
  • unaffected from 7.0.10 to 7.0.* (incl.)
  • unaffected from 7.1 to * (incl.)

References