ext4: fix buffer_head leak in ext4_init_orphan_info
Summary
| CVE | CVE-2026-92494 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-17 17:17:51 UTC |
| Updated | 2026-10-19 09:19:39 UTC |
| 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. |
Risk And Classification
EPSS: 0.002050000 probability, percentile 0.109500000 (date 2026-09-18)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 a9a6ec1298f9bc134b2c5db27d25bb10603b7113 git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 35fc83c65faf7949f5701bb34b20f822560a7718 git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 6ec53ccab0d691b3c73e03d930343ca45987e88d git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 1399f102d8a1855c1a38506057306ec79d0787d9 git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 e1e342d9a561c016b8531ec1f4dcefaad9d64954 git | Not specified |
| CNA | Linux | Linux | affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 05704335803b69c1bfa8637b7ada942bf2ee8a41 git | Not specified |
| CNA | Linux | Linux | affected 5.15 | Not specified |
| CNA | Linux | Linux | unaffected 5.15 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.221 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.188 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.157 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.110 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.52 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.6 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.