CVE-2026-53002: netfilter: conntrack: remove sprintf usage
Noroxi assessment
Priority: Monitor (action score 39/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.36% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e, 2f793ba78470a99f40389b7dc60a81d9f5ad3956, 6bbf829b4c1b44c941c47dd0d710f1393258f3d5; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e, 2f793ba78470a99f40389b7dc60a81d9f5ad3956, 6bbf829b4c1b44c941c47dd0d710f1393258f3d5; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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 [..]
- BDU:2026-13946
- ALSA-2026:64770
- ALSA-2026:66000
- ALSA-2026:66180
- RHSA-2026:64770
- RHSA-2026:66000
- RHSA-2026:66180
- RHSA-2026:69089
- RHSA-2026:69837
- RHSA-2026:69874
- RHSA-2026:69906
- RHSA-2026:73645
- RHSA-2026:74174
- RHSA-2026:77214
- RHSA-2026:77215
- RHSA-2026:81349
- RHSA-2026:81371
- RLSA-2026:64770
- RLSA-2026:66180
- Published
- Jun 24, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.3% · 30th percentile
- CWE
- CWE-787
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.20 and later · before 5.10.258
- linux linux kernel5.11 and later · before 5.15.209
- linux linux kernel5.16 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.141
- linux linux kernel6.7 and later · before 6.12.91
- linux linux kernel6.13 and later · before 6.18.33
- linux linux kernel6.19 and later · before 7.0.10
- redhat enterprise linux10.0
- redhat enterprise linux7.0
- redhat enterprise linux8.0
- redhat enterprise linux9.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.20affected
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before 2f793ba78470a99f40389b7dc60a81d9f5ad3956affected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before 6bbf829b4c1b44c941c47dd0d710f1393258f3d5affected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before ab64e61c9323fa6de21bd20da1ddb29a0fb65d34affected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1eaffected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before a8e0a32a23d3f34862af3b4da792ecb3a891a9a3affected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before 8e3be0d12615a173fe260cd42753ca7a001acbf2affected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before c08ff52e44945e6ef4ce0790f49ea761b060c45baffected · git
- 9fafcd7b203229c3f3893a475741afc27e276306 and later · before 6e7066bdb481a87fe88c4fa563e348c03b2d373daffected · git
- before 2.6.20not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.160.1.el8_10 | 4.18.0-553.160.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.160.1.rt7.501.el8_10 | 4.18.0-553.160.1.rt7.501.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-53000Jun 24, 2026 · netfilter: nat: use kfree_rcu to release ops31Monitor
- ← EarlierCVE-2026-53001Jun 24, 2026 · netfilter: xtables: restrict several matches to inet family22Monitor
- Later →CVE-2026-53003Jun 24, 2026 · pppoe: drop PFC frames30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e | Vendor (CNA) |
| Linux Linux | 2f793ba78470a99f40389b7dc60a81d9f5ad3956 | Vendor (CNA) |
| Linux Linux | 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 | Vendor (CNA) |
| Linux Linux | 6e7066bdb481a87fe88c4fa563e348c03b2d373d | Vendor (CNA) |
| Linux Linux | 8e3be0d12615a173fe260cd42753ca7a001acbf2 | Vendor (CNA) |
| Linux Linux | a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 | Vendor (CNA) |
| Linux Linux | ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 | Vendor (CNA) |
| Linux Linux | c08ff52e44945e6ef4ce0790f49ea761b060c45b | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.143.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:bpftool | 4.18.0-553.160.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.160.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-core | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-core | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-devel | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules-extra | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-devel | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules-extra | 4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-rt | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-core | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-core | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-debuginfo | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-devel | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-kvm | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-modules | 0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
+6
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0440 · Jun 25, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (15 more)Show less
- git.kernel.org/stable/c/2f793ba78470a99f40389b7dc60a81d9f5ad3956
- git.kernel.org/stable/c/6bbf829b4c1b44c941c47dd0d710f1393258f3d5
- git.kernel.org/stable/c/6e7066bdb481a87fe88c4fa563e348c03b2d373d
- git.kernel.org/stable/c/8e3be0d12615a173fe260cd42753ca7a001acbf2
- git.kernel.org/stable/c/a8e0a32a23d3f34862af3b4da792ecb3a891a9a3
- git.kernel.org/stable/c/ab64e61c9323fa6de21bd20da1ddb29a0fb65d34
- git.kernel.org/stable/c/c08ff52e44945e6ef4ce0790f49ea761b060c45b
- access.redhat.com/errata/RHSA-2026:64770
- access.redhat.com/errata/RHSA-2026:66000
- access.redhat.com/errata/RHSA-2026:66180
- access.redhat.com/security/cve/CVE-2026-53002
- bugzilla.redhat.com/show_bug.cgi?id=2492329
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53002.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.