CVE-2026-98082: btrfs: fix the possible bioc_list memory leak during error
btrfs: fix the possible bioclist memory leak during error
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.158.1-1 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1 - Upgrade
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debian/linux-6.12to a version that resolves this vulnerability.Fixed in 6.12.115-2~deb12u1 - Upgrade
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ubuntu/linux-hwe-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42~24.04.1 - Upgrade
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ubuntu/linux-riscv-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1~24.04.1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-42.42 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1016.17 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1016.18 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 7.0.0-1017.17 - Upgrade
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ubuntu/linux-oem-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1017.17 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 7.0.0-1015.16 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1 - Compensating control
Implement btrfs_cleanup_ordered_bioc_list() to remove and release all bioc entries from btrfs_ordered_extent::bioc_list, and call it from both btrfs_finish_one_ordered() before the ordered extent's final release and btrfs_insert_raid_extent() on all paths, including error paths.
Event History
Frequently Asked Questions
What conditions can lead to the memory leak?
The leak can occur if btrfs_insert_one_raid_extent() returns an error, causing btrfs_insert_raid_extent() to return without releasing entries in the ordered extent's bioc_list. It can also occur when an ordered extent has an I/O error and is marked BTRFS_ORDERED_IOERR, which skips btrfs_insert_raid_extent() entirely.
How can I verify that the fix is present?
Verify that the kernel includes btrfs_cleanup_ordered_bioc_list() and calls it from both btrfs_insert_raid_extent() and btrfs_finish_one_ordered(). The referenced stable commits contain the remediation.
Does the available information identify an attacker-controlled exploitation path?
No. The available information describes memory leaks triggered by internal Btrfs error and I/O-error handling paths, but does not identify an attacker-controlled input, required access level, or exploitation method.