In the Linux kernel, the following vulnerability has been resolved:
btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range
If we get -ENOMEM while dropping file extent items in a given range, at
btrfs_drop_extents(), due to failure to allocate memory when attempting to
increment the reference count for an extent or drop the reference count,
we handle it with a BUG_ON(). This is excessive, instead we can simply
abort the transaction and return the error to the caller. In fact most
callers of btrfs_drop_extents(), directly or indirectly, already abort
the transaction if btrfs_drop_extents() returns any error.
Also, we already have error paths at btrfs_drop_extents() that may return
-ENOMEM and in those cases we abort the transaction, like for example
anything that changes the b+tree may return -ENOMEM due to a failure to
allocate a new extent buffer when COWing an existing extent buffer, such
as a call to btrfs_duplicate_item() for example.
So replace the BUG_ON() calls with proper logic to abort the transaction
and return the error.
Metrics
Affected Vendors & Products
References
History
Wed, 17 Sep 2025 11:00:00 +0000
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First Time appeared |
Linux
Linux linux Kernel |
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Vendors & Products |
Linux
Linux linux Kernel |
Tue, 16 Sep 2025 00:15:00 +0000
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References |
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Metrics |
threat_severity
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cvssV3_1
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Mon, 15 Sep 2025 15:00:00 +0000
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Description | In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range If we get -ENOMEM while dropping file extent items in a given range, at btrfs_drop_extents(), due to failure to allocate memory when attempting to increment the reference count for an extent or drop the reference count, we handle it with a BUG_ON(). This is excessive, instead we can simply abort the transaction and return the error to the caller. In fact most callers of btrfs_drop_extents(), directly or indirectly, already abort the transaction if btrfs_drop_extents() returns any error. Also, we already have error paths at btrfs_drop_extents() that may return -ENOMEM and in those cases we abort the transaction, like for example anything that changes the b+tree may return -ENOMEM due to a failure to allocate a new extent buffer when COWing an existing extent buffer, such as a call to btrfs_duplicate_item() for example. So replace the BUG_ON() calls with proper logic to abort the transaction and return the error. | |
Title | btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range | |
References |
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Status: PUBLISHED
Assigner: Linux
Published: 2025-09-15T14:45:49.338Z
Updated: 2025-09-15T14:45:49.338Z
Reserved: 2025-09-15T14:18:36.811Z
Link: CVE-2022-50293

No data.

Status : Awaiting Analysis
Published: 2025-09-15T15:15:40.640
Modified: 2025-09-15T15:22:27.090
Link: CVE-2022-50293
