CVE-2026-92494
ext4: fix buffer_head leak in ext4_init_orphan_info
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.
INFO
Published Date :
Sept. 17, 2026, 5:17 p.m.
Last Modified :
Sept. 17, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel patch for ext4 buffer_head leak.
- Ensure the fix correctly tracks and releases buffer_heads.
- Verify no buffer_heads are leaked on error paths.
References to Advisories, Solutions, and Tools
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CVE-2026-92494.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-92494 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-92494
weaknesses.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 17, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/92xxx/CVE-2026-92494.json">CVE-2026-92494</a> Added Reference https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41 Added Reference https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9 Added Reference https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718 Added Reference https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d Added Reference https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe Added Reference https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113 Added Reference https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954