Bluetooth: L2CAP: validate option length before reading conf opt value
Noroxi assessment
Priority: Monitor (action score 28/100)
- 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: 0.26% (FIRST EPSS).
- Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 3.17, 3.19, 4.10; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.
Low priority for now. Upgrade to Linux Linux 3.17, 3.19, 4.10; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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: Bluetooth: L2CAP: validate option length before reading conf opt value l2cap_get_conf_opt() derives the option length from the attacker-controlled opt->len field and immediately dereferences opt->val (as u8, get_unaligned_le16() or get_unaligned_le32(), or a raw pointer for the default case) before any caller has confirmed that opt->len bytes are present in the buffer. The callers (l2cap_parse_conf_req(), l2cap_parse_conf_rsp() and l2cap_conf_rfc_get()) only detect a malformed option afterwards, once the running length has gone negative, by which point the out-of-bounds read has already executed. An existing post-hoc length check keeps the garbage value from being consumed, so this is not a data leak in the current control flow. It is still a validate-after-use ordering bug: up to 4 bytes are read past the end of the buffer before it is known to contain them, and it is fragile to future changes in the callers. Fix it at the source. Pass the end of the buffer into l2cap_get_conf_opt() and refuse to touch opt->val unless the full option (header + value) fits. Each caller computes an end pointer once before the loop and checks the return value directly instead of inferring the error from a negative length.
- Published
- Jul 25, 2026
- Updated
- Oct 16, 2026
- EPSS
- 0.2% · 17th percentile
- CWE
- CWE-476
Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.1
- 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 kernel3.16.66 and later · before 3.17
- linux linux kernel3.18.138 and later · before 3.19
- linux linux kernel4.4.178 and later · before 4.5
- linux linux kernel4.9.167 and later · before 4.10
- linux linux kernel4.14.110 and later · before 4.15
- linux linux kernel4.19.33 and later · before 4.20
- linux linux kernel5.0.6 and later · before 5.10.261
- linux linux kernel5.11 and later · before 5.15.212
- linux linux kernel5.16 and later · before 6.1.178
- linux linux kernel6.2 and later · before 6.6.145
- linux linux kernel6.7 and later · before 6.12.96
- linux linux kernel6.13 and later · before 6.18.39
- linux linux kernel6.19 and later · before 7.1.4
- linux linux kernel7.2
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
- 78c2887130f1a7d1883195732be1b6cdab667487, ac7c597c465eb09391e40febbe088bdad601080b, ade4560e4fea198866e033fe1c02f063d6d7db2e, 99665dcf6ff803351b5e658f3a929cb498561e36, 2b59d36f22622c92c0b06aee7571f0a86a217188, 15d6538a0d6e0f6de5116081a948cba7cc3e1d3d, a556547bae00528f24b42786b41a14047db14b84, 5.1affected
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before cca81b4bc672604a84f6d224a55cc77ec7dee619affected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before f70d4aa88068096f35d73e3a05eff33c0a16b9cdaffected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 7d871e969b941ce25653f7716203a0ea4d07ad4baffected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 98d93c226bdfaa79bbdd86981921d7f106374225affected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 996d3da39899aceb8f4910911a3f19a45a7d9d1baffected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 73abbaf91aa33da87c008fb62c148ade561bb606affected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 6b47bdaacfd0045687880177e0987055d8f4765aaffected · git
- 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 and later · before 687617555cedfb74c9e3cb85d759b908dcb17856affected · git
- 3.16.66 and later · before 3.17affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.180-1 | 6.1.180-1 |
| Debian:12 | linux-6.12 | before 6.12.100-1~deb12u1 | 6.12.100-1~deb12u1 |
| Debian:13 | linux | before 6.12.96-1 | 6.12.96-1 |
| Debian:14 | linux | before 7.1.4-1 | 7.1.4-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 3.17 | Vendor (CNA) |
| Linux Linux | 3.19 | Vendor (CNA) |
| Linux Linux | 4.10 | Vendor (CNA) |
| Linux Linux | 4.15 | Vendor (CNA) |
| Linux Linux | 4.20 | Vendor (CNA) |
| Linux Linux | 4.5 | Vendor (CNA) |
| Linux Linux | 5.1 | Vendor (CNA) |
| Linux Linux | 687617555cedfb74c9e3cb85d759b908dcb17856 | Vendor (CNA) |
| Linux Linux | 6b47bdaacfd0045687880177e0987055d8f4765a | Vendor (CNA) |
| Linux Linux | 73abbaf91aa33da87c008fb62c148ade561bb606 | Vendor (CNA) |
| Linux Linux | 7d871e969b941ce25653f7716203a0ea4d07ad4b | Vendor (CNA) |
| Linux Linux | 98d93c226bdfaa79bbdd86981921d7f106374225 | Vendor (CNA) |
| Linux Linux | 996d3da39899aceb8f4910911a3f19a45a7d9d1b | Vendor (CNA) |
| Linux Linux | cca81b4bc672604a84f6d224a55cc77ec7dee619 | Vendor (CNA) |
| Linux Linux | f70d4aa88068096f35d73e3a05eff33c0a16b9cd | Vendor (CNA) |
| azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 | 6.6.145.2-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.180-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.100-1~deb12u1 · Debian:12 | Package registry (OSV) |
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).
Technical details
Attack conditions
- Someone on the same network segment 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
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:A/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.
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 (7 more)Show less
- git.kernel.org/stable/c/6b47bdaacfd0045687880177e0987055d8f4765a
- git.kernel.org/stable/c/73abbaf91aa33da87c008fb62c148ade561bb606
- git.kernel.org/stable/c/7d871e969b941ce25653f7716203a0ea4d07ad4b
- git.kernel.org/stable/c/98d93c226bdfaa79bbdd86981921d7f106374225
- git.kernel.org/stable/c/996d3da39899aceb8f4910911a3f19a45a7d9d1b
- git.kernel.org/stable/c/cca81b4bc672604a84f6d224a55cc77ec7dee619
- git.kernel.org/stable/c/f70d4aa88068096f35d73e3a05eff33c0a16b9cd
Vendor advisories and official records. Exploit/PoC links are deliberately left out.