CVE-2026-53002

netfilter: conntrack: remove sprintf usage

publishedCWE-787

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 [..]

Technical severity9.8 criticalCVSS 3.1 · CNA: Linux

Published2026-06-24Source updated 2026-11-10

Collected2026-11-102 attributed sources

Fixes and workarounds

Fix

RHSA-2026:66180: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9) RHSA-2026:66000: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) RHSA-2026:64770: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)

Source: ADP: redhat-SADP

Workaround

To mitigate this issue, prevent the nf_conntrack_sip and nf_nat_sip modules from being loaded. See https://access.redhat.com/solutions/41278 for instructions.

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Linux Linux	≥ 9fafcd7b203229c3f3893a475741afc27e276306; < 2f793ba78470a99f40389b7dc60a81d9f5ad3956 (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < 8e3be0d12615a173fe260cd42753ca7a001acbf2 (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < c08ff52e44945e6ef4ce0790f49ea761b060c45b (affected, git) ≥ 9fafcd7b203229c3f3893a475741afc27e276306; < 6e7066bdb481a87fe88c4fa563e348c03b2d373d (affected, git) Other versions: unaffected	CNA: Linux
Linux Linux	2.6.20 (affected) ≥ 0; < 2.6.20 (unaffected, semver) ≥ 5.10.258; ≤ 5.10.* (unaffected, semver) ≥ 5.15.209; ≤ 5.15.* (unaffected, semver) ≥ 6.1.175; ≤ 6.1.* (unaffected, semver) ≥ 6.6.141; ≤ 6.6.* (unaffected, semver) ≥ 6.12.91; ≤ 6.12.* (unaffected, semver) ≥ 6.18.33; ≤ 6.18.* (unaffected, semver) ≥ 7.0.10; ≤ 7.0.* (unaffected, semver) ≥ 7.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected	CNA: Linux
Red Hat Enterprise Linux 8 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	≥ 0:4.18.0-553.160.1.rt7.501.el8_10; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:4.18.0-553.160.1.el8_10; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:5.14.0-687.46.1.el9_8; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 9.8 critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`	CNA: Linux
3.1 / 7.0 high	`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://git.kernel.org/stable/c/2f793ba78470a99f40389b7dc60a81d9f5ad3956CNA: Linux
https://git.kernel.org/stable/c/6bbf829b4c1b44c941c47dd0d710f1393258f3d5CNA: Linux
https://git.kernel.org/stable/c/ab64e61c9323fa6de21bd20da1ddb29a0fb65d34CNA: Linux
https://git.kernel.org/stable/c/1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1eCNA: Linux
https://git.kernel.org/stable/c/a8e0a32a23d3f34862af3b4da792ecb3a891a9a3CNA: Linux
https://git.kernel.org/stable/c/8e3be0d12615a173fe260cd42753ca7a001acbf2CNA: Linux
https://git.kernel.org/stable/c/c08ff52e44945e6ef4ce0790f49ea761b060c45bCNA: Linux
https://git.kernel.org/stable/c/6e7066bdb481a87fe88c4fa563e348c03b2d373dCNA: Linux
https://access.redhat.com/security/cve/CVE-2026-53002ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492329ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53002.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:66180ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:66000ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64770ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP

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