Vulnerability · Published Mar 3, 2022 · Assigned by redhat
CVE-2021-3640
High 7.0
In plain English
A high-severity race condition in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)0.4%top 68.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | bpftool | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | bpftool | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-abi-stablelists | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-abi-stablelists | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-core | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-core | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-cross-headers | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-cross-headers | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-debug | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-debug | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-debug-core | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-debug-core | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-debug-devel | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-debug-devel | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:9 | kernel-debug-devel-matched | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-debug-modules | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-debug-modules | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-debug-modules-extra | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-debug-modules-extra | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-devel | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-devel | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:9 | kernel-devel-matched | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-doc | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-doc | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-headers | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-headers | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-modules | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-modules | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-modules-extra | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-modules-extra | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-rt | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-core | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-core | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug-core | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug-core | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug-devel | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug-devel | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug-kvm | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug-kvm | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug-modules | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug-modules | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-debug-modules-extra | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-devel | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-devel | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-kvm | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-kvm | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-modules | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-modules | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-rt-modules-extra | 4.18.0-425.3.1.rt7.213.el8 | ALSA-2022:7444 |
| AlmaLinux:9 | kernel-rt-modules-extra | 5.14.0-162.6.1.rt21.168.el9_1 | ALSA-2022:7933 |
| AlmaLinux:8 | kernel-tools | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-tools | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-tools-libs | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-tools-libs | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-tools-libs-devel | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-zfcpdump | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-zfcpdump | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-zfcpdump-core | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-zfcpdump-core | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-zfcpdump-devel | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-zfcpdump-devel | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:9 | kernel-zfcpdump-devel-matched | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-zfcpdump-modules | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-zfcpdump-modules | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | kernel-zfcpdump-modules-extra | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | kernel-zfcpdump-modules-extra | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | perf | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | perf | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| AlmaLinux:8 | python3-perf | 4.18.0-425.3.1.el8 | ALSA-2022:7683 |
| AlmaLinux:9 | python3-perf | 5.14.0-162.6.1.el9_1 | ALSA-2022:8267 |
| Debian:12 | linux | 5.15.3-1 | DEBIAN-CVE-2021-3640 |
| Debian:13 | linux | 5.15.3-1 | DEBIAN-CVE-2021-3640 |
| Debian:14 | linux | 5.15.3-1 | DEBIAN-CVE-2021-3640 |
| Rocky Linux:8 | kernel | 0:4.18.0-425.3.1.el8 | RLSA-2022:7683 |
| Rocky Linux:8 | kernel-rt | 0:4.18.0-425.3.1.rt7.213.el8 | RLSA-2022:7444 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2021-3640 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2021-3640 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2021-3640 |
Affected products (as reported)
Weakness: CWE-362
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1980646 x_refsource_MISC
- https://ubuntu.com/security/CVE-2021-3640 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/07/22/1 x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951 x_refsource_MISC
- https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951 x_refsource_MISC
- [debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update mailing-list, x_refsource_MLIST
- DSA-5096 vendor-advisory, x_refsource_DEBIAN
- https://security.netapp.com/advisory/ntap-20220419-0003/ x_refsource_CONFIRM