5.5

CVE-2022-48947: Bluetooth: L2CAP: Fix u8 overflow

Analyzed
AliasesUBUNTU-CVE-2022-48947DEBIAN-CVE-2022-48947
Published 21-10-2024Last modified 11-05-2026

Vulnerability summary

CVE-2022-48947 is a medium (CVSS 5.5) Integer Overflow or Wraparound vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 8
RHSA-2024:2394RHSA-2024:3138SUSE-SU-2024:3983-1SUSE-SU-2024:3985-1SUSE-SU-2024:4081-1SUSE-SU-2024:4082-1

Timeline

  1. 21-10-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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 ........@...

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu113 products
  • linuxAll versions (No fix recorded) | < 4.4.0-236.270 | < 4.15.0-202.213 | < 5.4.0-137.154 | < 5.15.0-58.64
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1115.121 | < 4.4.0-1153.168 | < 4.15.0-1148.160 | < 5.4.0-1094.102 | < 5.15.0-1028.32
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < 49d5867819ab7c744852b45509e8469839c07e0e | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < 95f1847a361c7b4bf7d74c06ecb6968455082c1a | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < ad528fde0702903208d0a79d88d5a42ae3fc235b | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < 9fdc79b571434af7bc742da40a3405f038b637a7 | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < f3fe6817156a2ad4b06f01afab04638a34d7c9a6 | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < 19a78143961a197de8502f4f29c453b913dc3c29 | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < 5550bbf709c323194881737fd290c4bada9e6ead | ≥ f2fcfcd670257236ebf2088bbdf26f6a8ef459fe, < bcd70260ef56e0aee8a4fc6cd214a419900b0765 | 2.6.32
  • linux_kernel< 4.9.337 | ≥ 4.10, < 4.14.303 | ≥ 4.15, < 4.19.270 | ≥ 4.20, < 5.4.229 | ≥ 5.5, < 5.10.161 | ≥ 5.11, < 5.15.85 | ≥ 5.16, < 6.0.15 | 6.1:rc1 | 6.1:rc2 | 6.1:rc3 | 6.1:rc4 | 6.1:rc5 | 6.1:rc6 | 6.1:rc7 | 6.1:rc8
Debian1 product
  • linux< 6.1.4-1

3 vendors · 116 products

References

12 links
Show all 12 references