7.8

CVE-2022-50219: bpf: Fix KASAN use-after-free Read in compute_effective_progs

Modified
AliasesUBUNTU-CVE-2022-50219DEBIAN-CVE-2022-50219
Published 18-06-2025Last modified 05-08-2026

Vulnerability summary

CVE-2022-50219 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · +0.01 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 2
RHSA-2020:4431RHSA-2023:2458

Timeline

  1. 18-06-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix KASAN use-after-free Read in compute_effective_progs Syzbot found a Use After Free bug in compute_effective_progs(). The reproducer creates a number of BPF links, and causes a fault injected alloc to fail, while calling bpf_link_detach on them. Link detach triggers the link to be freed by bpf_link_free(), which calls __cgroup_bpf_detach() and update_effective_progs(). If the memory allocation in this function fails, the function restores the pointer to the bpf_cgroup_link on the cgroup list, but the memory gets freed just after it returns. After this, every subsequent call to update_effective_progs() causes this already deallocated pointer to be dereferenced in prog_list_length(), and triggers KASAN UAF error. To fix this issue don't preserve the pointer to the prog or link in the list, but remove it and replace it with a dummy prog without shrinking the table. The subsequent call to __cgroup_bpf_detach() or __cgroup_bpf_detach() will correct it.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.23% 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.

Ubuntu94 products
  • linux< 5.15.0-53.59
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1023.27
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ af6eea57437a830293eab56246b6025cc7d46ee7, < 3527e3cbb84d8868c4d4e91ba55915f96d39ec3d | ≥ af6eea57437a830293eab56246b6025cc7d46ee7, < 1f8ca9c40e6222ce431e9ba5dae3cccce8ef9443 | ≥ af6eea57437a830293eab56246b6025cc7d46ee7, < 6336388715afa419cc97d0255bda3bba1b96b7ca | ≥ af6eea57437a830293eab56246b6025cc7d46ee7, < be001f9da71eaa3b61e186fb88bde3279728bdca | ≥ af6eea57437a830293eab56246b6025cc7d46ee7, < 4c46091ee985ae84c60c5e95055d779fcd291d87 | 5.7
  • linux_kernel≥ 5.7, < 5.10.138 | ≥ 5.11, < 5.15.61 | ≥ 5.16, < 5.18.18 | ≥ 5.19, < 5.19.2
Debian1 product
  • linux< 6.0.2-1

3 vendors · 97 products

References

8 links