Vulnerability · Published Feb 5, 2021 · Assigned by mitre
CVE-2021-26708
High 7.0
In plain English
A high-severity security flaw in the kernel-abi-whitelists package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)1.6%top 24.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC
Official description
A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-abi-whitelists | 4.18.0-240.22.1.el8_3 | ALSA-2021:1093 |
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-240.22.1.el8_3 | ALSA-2021:1093 |
| Debian:12 | linux | 5.10.13-1 | DEBIAN-CVE-2021-26708 |
| Debian:13 | linux | 5.10.13-1 | DEBIAN-CVE-2021-26708 |
| Debian:14 | linux | 5.10.13-1 | DEBIAN-CVE-2021-26708 |
Affected products (as reported)
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446 x_refsource_MISC
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/02/04/5 x_refsource_MISC
- [oss-security] 20210205 Re: Linux kernel: Exploitable vulnerabilities in AF_VSOCK implementation mailing-list, x_refsource_MLIST
- https://security.netapp.com/advisory/ntap-20210312-0008/ x_refsource_CONFIRM
- [oss-security] 20210409 Re: Linux kernel: Exploitable vulnerabilities in AF_VSOCK implementation mailing-list, x_refsource_MLIST
- [oss-security] 20220125 CVE-2022-0185: Linux kernel slab out-of-bounds write: exploit and writeup mailing-list, x_refsource_MLIST