CVE-2022-50293
btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 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)
- 0.16% · top 95% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 39279cc3d2704cfbf9c35dcb5bdd392159ae4625 – < 50f993da945074b2a069da099a0331b23a0c89a0
- affected 39279cc3d2704cfbf9c35dcb5bdd392159ae4625 – < 7fbcb635c8fc927d139f3302babcf1b42c09265c
- affected 39279cc3d2704cfbf9c35dcb5bdd392159ae4625 – < 1baf3370e2dc5e6bd1368348736189457dab2a27
- affected 39279cc3d2704cfbf9c35dcb5bdd392159ae4625 – < 162d053e15fe985f754ef495a96eb3db970c43ed
- affected 2.6.29
- unaffected < 2.6.29
- unaffected 5.15.86 – ≤ 5.15.*
- unaffected 6.0.16 – ≤ 6.0.*
- unaffected 6.1.2 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References (4)
- https://git.kernel.org/stable/c/50f993da945074b2a069da099a0331b23a0c89a0 (opens in a new tab)
- https://git.kernel.org/stable/c/7fbcb635c8fc927d139f3302babcf1b42c09265c (opens in a new tab)
- https://git.kernel.org/stable/c/1baf3370e2dc5e6bd1368348736189457dab2a27 (opens in a new tab)
- https://git.kernel.org/stable/c/162d053e15fe985f754ef495a96eb3db970c43ed (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)
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[](https://trackcve.app/cve/CVE-2022-50293)Record last updated .