CVE-2026-53002
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
In the Linux kernel netfilter/conntrack subsystem, a stack buffer overflow was found in the mangle_content_len() function. The fix replaces sprintf() with scnprintf() and increases the buffer size.
Risk Assessment
An attacker can remotely trigger a kernel panic by sending a crafted SIP packet, leading to a denial of service (DoS).
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit removing sprintf in netfilter/conntrack).
Original NVD description (English source)
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 [..]