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CVE-2026-53002

Linux Kernel buffer overflow

9.8 CRITICALEPSS 0.37%
  1. Published24 Jun 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 2.6.20 < 5.10.258 · ≥ 5.11 < 5.15.209 · ≥ 5.16 < 6.1.175 · ≥ 6.13 < 6.18.33
Redhat Enterprise Linux10.0 · 7.0 · 8.0 · 9.0

Remediation

Fixed in
Linux Kernel≥ 5.10.258

References

and 5 more references

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Frequently asked

Is CVE-2026-53002 being actively exploited?

CVE-2026-53002 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.37%.

How severe is CVE-2026-53002?

CVE-2026-53002 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2026-53002?

Affected products include Linux Kernel, Redhat Enterprise Linux.

How do I fix CVE-2026-53002?

Upgrade affected software to a fixed version, for example Linux Kernel 5.10.258 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-53002 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.