Uncaught Exception Affecting kernel-rt-kvm package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL7-KERNELRTKVM-9557503
- published28 Mar 2025
- disclosed27 Mar 2025
Introduced: 27 Mar 2025
NewCVE-2022-49761 (opens in a new tab)How to fix?
There is no fixed version for RHEL:7 kernel-rt-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
btrfs: always report error in run_one_delayed_ref()
Currently we have a btrfs_debug() for run_one_delayed_ref() failure, but if end users hit such problem, there will be no chance that btrfs_debug() is enabled. This can lead to very little useful info for debugging.
This patch will:
Add extra info for error reporting Including:
- logical bytenr
- num_bytes
- type
- action
- ref_mod
Replace the btrfs_debug() with btrfs_err()
Move the error reporting into run_one_delayed_ref() This is to avoid use-after-free, the @node can be freed in the caller.
This error should only be triggered at most once.
As if run_one_delayed_ref() failed, we trigger the error message, then causing the call chain to error out:
btrfs_run_delayed_refs()
- btrfs_run_delayed_refs() - btrfs_run_delayed_refs_for_head()
`- run_one_delayed_ref()
And we will abort the current transaction in btrfs_run_delayed_refs(). If we have to run delayed refs for the abort transaction, run_one_delayed_ref() will just cleanup the refs and do nothing, thus no new error messages would be output.
References
- https://access.redhat.com/security/cve/CVE-2022-49761
- https://git.kernel.org/stable/c/18bd1c9c02e64a3567f90c83c2c8b855531c8098
- https://git.kernel.org/stable/c/39f501d68ec1ed5cd5c66ac6ec2a7131c517bb92
- https://git.kernel.org/stable/c/853ffa1511b058c79a4c9bb1407b3b20ce311792
- https://git.kernel.org/stable/c/fdb4a70bb768d2a87890409597529ad81cb3de8a