In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode -… (CVE-2026-63816)
A use-after-free (UAF) vulnerability was identified and resolved in the Linux kernel's f2fs filesystem code. The issue involved improper handling of a reference to the atomic_inode structure during garbage collection, which could lead to accessing freed memory. The fix ensures a proper reference is held before using the mapping field to prevent the UAF condition.
AI Analysis
Technical Summary
The vulnerability CVE-2026-63816 in the Linux kernel's f2fs filesystem relates to a use-after-free issue on the f2fs_inode_info.atomic_inode structure. During the garbage collection process triggered by ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE), the code accessed the mapping field of atomic_inode without holding a proper reference, leading to potential use-after-free. The flaw was fixed by adding a reference on fi->atomic_inode before accessing its mapping field, preventing the UAF condition.
Potential Impact
If exploited, this vulnerability could cause kernel memory corruption due to use-after-free, potentially leading to system instability or escalation of privileges. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel. Users and administrators should apply the official kernel updates that include this patch. Since no vendor advisory or patch links are provided here, check the official Linux kernel repositories or vendor advisories for the specific patch and update instructions.
In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode -… (CVE-2026-63816)
Description
A use-after-free (UAF) vulnerability was identified and resolved in the Linux kernel's f2fs filesystem code. The issue involved improper handling of a reference to the atomic_inode structure during garbage collection, which could lead to accessing freed memory. The fix ensures a proper reference is held before using the mapping field to prevent the UAF condition.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-63816 in the Linux kernel's f2fs filesystem relates to a use-after-free issue on the f2fs_inode_info.atomic_inode structure. During the garbage collection process triggered by ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE), the code accessed the mapping field of atomic_inode without holding a proper reference, leading to potential use-after-free. The flaw was fixed by adding a reference on fi->atomic_inode before accessing its mapping field, preventing the UAF condition.
Potential Impact
If exploited, this vulnerability could cause kernel memory corruption due to use-after-free, potentially leading to system instability or escalation of privileges. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel. Users and administrators should apply the official kernel updates that include this patch. Since no vendor advisory or patch links are provided here, check the official Linux kernel repositories or vendor advisories for the specific patch and update instructions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-gp48-qw68-qgg5
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63816"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ad2a4a8d59891318f7
Added to database: 07/19/2026, 19:38:21 UTC
Last enriched: 07/19/2026, 20:20:51 UTC
Last updated: 07/20/2026, 06:51:34 UTC
Views: 8
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