CVE-2026-53268: netfilter: conntrack_irc: fix possible out-of-bounds read
Noroxi assessment
Priority: Monitor (action score 32/100)
- 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: 0.52% (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 0afc802160af0df61ed374fdb97fb34cfe5cdf2f, 4cdda7f868f48e2f81579371584fdbdce37df2c8, 573810f61bcd6b6815e2ff53bbdd2b9c9d747176; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
Low priority for now. Upgrade to Linux Linux 0afc802160af0df61ed374fdb97fb34cfe5cdf2f, 4cdda7f868f48e2f81579371584fdbdce37df2c8, 573810f61bcd6b6815e2ff53bbdd2b9c9d747176; azl3 kernel 6.6.141.1-1 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_irc: fix possible out-of-bounds read When parsing fails after we've matched the command string we should bail out instead of trying to match a different command. This helper should be deprecated, given prevalence of TLS I doubt it has any relevance in 2026.
- Published
- Jun 25, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.5% · 44th percentile
- CWE
- CWE-125
Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 8.2
- 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 |
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 5.10.259
- linux linux kernel5.11 and later · before 5.15.210
- linux linux kernel5.16 and later · before 6.1.176
- linux linux kernel6.2 and later · before 6.6.143
- linux linux kernel6.7 and later · before 6.12.94
- linux linux kernel6.13 and later · before 6.18.36
- linux linux kernel6.19 and later · before 7.0.13
- linux linux kernel7.1
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
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 4cdda7f868f48e2f81579371584fdbdce37df2c8affected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 8a1d6e40dedfe1068aee094d851bd69e289c9fd6affected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 0afc802160af0df61ed374fdb97fb34cfe5cdf2faffected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 7c34f91305292083253df6a9f6c8ede02d4ccaeaaffected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before ddddd8271359961e403d11c90c9ba9fc38914f7eaffected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 9e5da2379f968a3ea5a6e38921ab6201576466dcaffected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 573810f61bcd6b6815e2ff53bbdd2b9c9d747176affected · git
- 869f37d8e48f3911eb70f38a994feaa8f8380008 and later · before 66eba0ffce3b7e11449946b4cbbef8ea36112f56affected · 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 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.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-2026-53265Jun 25, 2026 · dm cache policy smq: check allocation under invalidate lock31Monitor
- ← EarlierCVE-2026-53267Jun 25, 2026 · netfilter: nft_ct: bail out on template ct in get eval31Monitor
- Later →CVE-2026-53269Jun 25, 2026 · netfilter: synproxy: add mutex to guard hook reference counting22Monitor
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 | 0afc802160af0df61ed374fdb97fb34cfe5cdf2f | Vendor (CNA) |
| Linux Linux | 4cdda7f868f48e2f81579371584fdbdce37df2c8 | Vendor (CNA) |
| Linux Linux | 573810f61bcd6b6815e2ff53bbdd2b9c9d747176 | Vendor (CNA) |
| Linux Linux | 66eba0ffce3b7e11449946b4cbbef8ea36112f56 | Vendor (CNA) |
| Linux Linux | 7c34f91305292083253df6a9f6c8ede02d4ccaea | Vendor (CNA) |
| Linux Linux | 8a1d6e40dedfe1068aee094d851bd69e289c9fd6 | Vendor (CNA) |
| Linux Linux | 9e5da2379f968a3ea5a6e38921ab6201576466dc | Vendor (CNA) |
| Linux Linux | ddddd8271359961e403d11c90c9ba9fc38914f7e | Vendor (CNA) |
| azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 | 6.6.143.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.42.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstream | 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.
No history yet (it accumulates with the daily EPSS job).
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).
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
- low · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (10 more)Show less
- git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8
- git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176
- git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56
- git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea
- git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6
- git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc
- git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.