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Critical severity · published Jun 24, 2026
CVE-2026-53002
netfilter: conntrack: remove sprintf usage
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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 [..]
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.20 before 5.10.258; 5.11 before 5.15.209; 5.16 before 6.1.175; 6.2 before 6.6.141; 6.7 before 6.12.91; 6.13 before 6.18.33; +1 more · source: NVD
LI
Linux · Linux
9fafcd7b203229c3f3893a475741afc27e276306 before 2f793ba78470a99f40389b7dc60a81d9f5ad3956; 9fafcd7b203229c3f3893a475741afc27e276306 before 6bbf829b4c1b44c941c47dd0d710f1393258f3d5; 9fafcd7b203229c3f3893a475741afc27e276306 before ab64e61c9323fa6de21bd20da1ddb29a0fb65d34; 9fafcd7b203229c3f3893a475741afc27e276306 before 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e; 9fafcd7b203229c3f3893a475741afc27e276306 before a8e0a32a23d3f34862af3b4da792ecb3a891a9a3; 9fafcd7b203229c3f3893a475741afc27e276306 before 8e3be0d12615a173fe260cd42753ca7a001acbf2; +3 more · source: vendor
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0; 10.0 · source: NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7 · source: CISA
Affected product
KE
Kernel
Linux
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53002
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53002
Patch
https://git.kernel.org/stable/c/1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e
Patch
https://git.kernel.org/stable/c/2f793ba78470a99f40389b7dc60a81d9f5ad3956
Patch
https://git.kernel.org/stable/c/6bbf829b4c1b44c941c47dd0d710f1393258f3d5
Patch
https://git.kernel.org/stable/c/6e7066bdb481a87fe88c4fa563e348c03b2d373d
Patch
https://git.kernel.org/stable/c/8e3be0d12615a173fe260cd42753ca7a001acbf2
Patch
https://git.kernel.org/stable/c/a8e0a32a23d3f34862af3b4da792ecb3a891a9a3
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