CVE-2022-3640: Linux Kernel Bluetooth l2cap_core.c l2cap_conn_del use after free
Vulnerability summary
CVE-2022-3640 is a high (CVSS 8.8) vulnerability in debian debian_linux. EPSS estimates a 1.21% chance of exploitation in the next 30 days, higher than 68.3% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.5, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 47 · Related 37Timeline
- 21-10-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability, which was classified as critical, was found in Linux Kernel. Affected is the function l2cap_conn_del of the file net/bluetooth/l2cap_core.c of the component Bluetooth. The manipulation leads to use after free. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-211944.
CVSS metrics
4 scores · 4 sources · 1 version- CVE.orgCNA5.5MediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.21%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
Increase +0.08 pp
From 1.13% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (git.kernel.org)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.
- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Affected systems
Known conditions: adjacent network, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu93 products
- linux< 4.4.0-270.304 | < 4.15.0-206.217 | < 5.4.0-139.156 | < 5.15.0-60.66
- linux-aws< 4.4.0-1145.151 | < 4.4.0-1183.198 | < 4.15.0-1151.164 | < 5.4.0-1096.104 | < 5.15.0-1030.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
- linux-aws-5.13All versions (No fix recorded)
Debian2 products
- linux< 6.0.8-1
- debian_linuxEOL10.0
Linux2 products
- kerneln/a
- linux_kernel≥ 4.9.326, < 4.9.333 | ≥ 4.14.291, < 4.14.299 | ≥ 4.19.255, < 4.19.265 | ≥ 5.4.209, < 5.4.224 | ≥ 5.10.135, < 5.10.154 | ≥ 5.15.59, < 5.15.79 | ≥ 5.18.16, < 6.0.8
Fedoraproject1 product
- fedoraEOL35 | 36 | 37
Opensuse1 product
- kernel-source&distro=openSUSE Tumbleweed< 6.0.5-1.1
5 vendors · 99 products
References
34 links- vuldb.com?id.211944Third Party Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
