9.8

CVE-2026-53002: netfilter: conntrack: remove sprintf usage

Modified
AliasesUBUNTU-CVE-2026-53002DEBIAN-CVE-2026-53002
Published 24-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-53002 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 79 · Related 65
LSN-0122-1OPENSUSE-SU-2026:21555-1RHSA-2026:64770RHSA-2026:66000RHSA-2026:66180RHSA-2026:69089

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu166 products
  • linux< 3.13.0-217.268 | < 4.4.0-287.321 | < 4.15.0-254.266 | < 5.4.0-234.254 | < 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded) | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1158.164 | < 4.4.0-1196.211 | < 4.15.0-1195.208 | < 5.4.0-1162.173 | < 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded) | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 9fafcd7b203229c3f3893a475741afc27e276306, < 2f793ba78470a99f40389b7dc60a81d9f5ad3956 | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < 8e3be0d12615a173fe260cd42753ca7a001acbf2 | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < c08ff52e44945e6ef4ce0790f49ea761b060c45b | ≥ 9fafcd7b203229c3f3893a475741afc27e276306, < 6e7066bdb481a87fe88c4fa563e348c03b2d373d | 2.6.20
  • linux_kernel≥ 2.6.20, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.141 | ≥ 6.7, < 6.12.91 | ≥ 6.13, < 6.18.33 | ≥ 6.19, < 7.0.10
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.10-1
Redhat1 product

4 vendors · 170 products

References

73 links
Show all 73 references