What’s Vulnerable › Vulnerabilities

CVE-2026-43393: btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies() Fix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL, we're not freeing the chunk map that we've just looked up.

Affected products

• Linux kernel: from 6.12 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2 — fixed in 6.12.78, 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 6.12.78, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5
• https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab
• https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a
• https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050

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