CVE-2021-47433
What it is
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix abort logic in btrfs_replace_file_extents Error injection testing uncovered a case where we'd end up with a corrupt file system with a missing extent in the middle of a file. This occurs because the if statement to decide if we should abort is wrong. The only way we would abort in this case is if we got a ret != -EOPNOTSUPP and we called from the file clone code. However the prealloc code uses this path too. Instead we need to abort if there is an error, and the only error we _don't_ abort on is -EOPNOTSUPP and only if we came from the clone file code.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. High risk of data tampering, service disruption.
- Exploit odds
- 0.6% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.6% in the next 30 days (EPSS).
- Severity: 8.1 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.6% · EPSS, next 30 days
- Record status
- Modified
Affected
- Linux Kernel < 5.10.75
- Linux Kernel < 5.14.14
- Linux Kernel 5.15
Attack profile CVSS 3.1 · 8.1
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-47433.md and follow it. Check whether this project is affected by CVE-2021-47433. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://git.kernel.org/stable/c/0e309e1152fc34ef75991d9d69b165dbf75bf26c
- https://git.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378
- https://git.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108f
- https://git.kernel.org/stable/c/0e309e1152fc34ef75991d9d69b165dbf75bf26c
- https://git.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378
- https://git.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108f
References
- https://git.kernel.org/stable/c/0e309e1152fc34ef75991d9d69b165dbf75bf26c
- https://git.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378
- https://git.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108f
- https://git.kernel.org/stable/c/0e309e1152fc34ef75991d9d69b165dbf75bf26c
- https://git.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378
- https://git.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108f