CVE-2022-48947
Bluetooth: L2CAP: Fix u8 overflow
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix u8 overflow By keep sending L2CAP_CONF_REQ packets, chan->num_conf_rsp increases multiple times and eventually it will wrap around the maximum number (i.e., 255). This patch prevents this by adding a boundary check with L2CAP_MAX_CONF_RSP Btmon log: Bluetooth monitor ver 5.64 = Note: Linux version 6.1.0-rc2 (x86_64) 0.264594 = Note: Bluetooth subsystem version 2.22 0.264636 @ MGMT Open: btmon (privileged) version 1.22 {0x0001} 0.272191 = New Index: 00:00:00:00:00:00 (Primary,Virtual,hci0) [hci0] 13.877604 @ RAW Open: 9496 (privileged) version 2.22 {0x0002} 13.890741 = Open Index: 00:00:00:00:00:00 [hci0] 13.900426 (...) > ACL Data RX: Handle 200 flags 0x00 dlen 1033 #32 [hci0] 14.273106 invalid packet size (12 != 1033) 08 00 01 00 02 01 04 00 01 10 ff ff ............ > ACL Data RX: Handle 200 flags 0x00 dlen 1547 #33 [hci0] 14.273561 invalid packet size (14 != 1547) 0a 00 01 00 04 01 06 00 40 00 00 00 00 00 ........@..... > ACL Data RX: Handle 200 flags 0x00 dlen 2061 #34 [hci0] 14.274390 invalid packet size (16 != 2061) 0c 00 01 00 04 01 08 00 40 00 00 00 00 00 00 04 ........@....... > ACL Data RX: Handle 200 flags 0x00 dlen 2061 #35 [hci0] 14.274932 invalid packet size (16 != 2061) 0c 00 01 00 04 01 08 00 40 00 00 00 07 00 03 00 ........@....... = bluetoothd: Bluetooth daemon 5.43 14.401828 > ACL Data RX: Handle 200 flags 0x00 dlen 1033 #36 [hci0] 14.275753 invalid packet size (12 != 1033) 08 00 01 00 04 01 04 00 40 00 00 00 ........@...
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 84% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < 49d5867819ab7c744852b45509e8469839c07e0e
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < 95f1847a361c7b4bf7d74c06ecb6968455082c1a
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < ad528fde0702903208d0a79d88d5a42ae3fc235b
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < 9fdc79b571434af7bc742da40a3405f038b637a7
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < f3fe6817156a2ad4b06f01afab04638a34d7c9a6
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < 19a78143961a197de8502f4f29c453b913dc3c29
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < 5550bbf709c323194881737fd290c4bada9e6ead
- affected f2fcfcd670257236ebf2088bbdf26f6a8ef459fe – < bcd70260ef56e0aee8a4fc6cd214a419900b0765
- affected 2.6.32
- unaffected < 2.6.32
- unaffected 4.9.337 – ≤ 4.9.*
- unaffected 4.14.303 – ≤ 4.14.*
- unaffected 4.19.270 – ≤ 4.19.*
- unaffected 5.4.229 – ≤ 5.4.*
- unaffected 5.10.161 – ≤ 5.10.*
- unaffected 5.15.85 – ≤ 5.15.*
- unaffected 6.0.15 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (8)
- https://git.kernel.org/stable/c/49d5867819ab7c744852b45509e8469839c07e0e (opens in a new tab)
- https://git.kernel.org/stable/c/95f1847a361c7b4bf7d74c06ecb6968455082c1a (opens in a new tab)
- https://git.kernel.org/stable/c/ad528fde0702903208d0a79d88d5a42ae3fc235b (opens in a new tab)
- https://git.kernel.org/stable/c/9fdc79b571434af7bc742da40a3405f038b637a7 (opens in a new tab)
- https://git.kernel.org/stable/c/f3fe6817156a2ad4b06f01afab04638a34d7c9a6 (opens in a new tab)
- https://git.kernel.org/stable/c/19a78143961a197de8502f4f29c453b913dc3c29 (opens in a new tab)
- https://git.kernel.org/stable/c/5550bbf709c323194881737fd290c4bada9e6ead (opens in a new tab)
- https://git.kernel.org/stable/c/bcd70260ef56e0aee8a4fc6cd214a419900b0765 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-48947)Record last updated .