CVE-2022-49873
bpf: Fix wrong reg type conversion in release_reference()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 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)
- 0.21% · top 88% of all CVEs (7 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 fd978bf7fd312581a7ca454a991f0ffb34c4204b – < cedd4f01f67be94735f15123158f485028571037
- affected fd978bf7fd312581a7ca454a991f0ffb34c4204b – < 466ce46f251dfb259a8cbaa895ab9edd6fb56240
- affected fd978bf7fd312581a7ca454a991f0ffb34c4204b – < ae5ccad6c711db0f2ca1231be051935dd128b8f5
- affected fd978bf7fd312581a7ca454a991f0ffb34c4204b – < f1db20814af532f85e091231223e5e4818e8464b
- affected 4.20
- unaffected < 4.20
- unaffected 5.10.155 – ≤ 5.10.*
- unaffected 5.15.79 – ≤ 5.15.*
- unaffected 6.0.9 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (4)
- https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037 (opens in a new tab)
- https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240 (opens in a new tab)
- https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5 (opens in a new tab)
- https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b (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-2022-49873)Record last updated .