CVE-2026-92494

Summary

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

VendorProductVersion RangeStatus
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < a9a6ec1298f9bc134b2c5db27d25bb10603b7113affected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < 35fc83c65faf7949f5701bb34b20f822560a7718affected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < 74637f7fef030e5fb2e835b7dfeb05efdc48e0feaffected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < 6ec53ccab0d691b3c73e03d930343ca45987e88daffected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < 1399f102d8a1855c1a38506057306ec79d0787d9affected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < e1e342d9a561c016b8531ec1f4dcefaad9d64954affected
LinuxLinux02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 < 05704335803b69c1bfa8637b7ada942bf2ee8a41affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References