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CVE-2026-92494

Unknown

Last modified

CVE-2026-92494 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path..

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < a9a6ec1298f9bc134b2c5db27d25bb10603b7113; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 35fc83c65faf7949f5701bb34b20f822560a7718; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 6ec53ccab0d691b3c73e03d930343ca45987e88d; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 1399f102d8a1855c1a38506057306ec79d0787d9; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < e1e342d9a561c016b8531ec1f4dcefaad9d64954; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 05704335803b69c1bfa8637b7ada942bf2ee8a41
LinuxLinux5.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-92494?
In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.
How severe is CVE-2026-92494?
Severity scoring for CVE-2026-92494 is pending analysis.
How do I fix CVE-2026-92494?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST