CVE-2026-89498: orangefs: fix double-free of trailer_buf on readdir copy failure
In the Linux kernel, the following vulnerability has been resolved:
orangefs: fix double-free of trailerbuf on readdir copy failure
On a readdir downcall, orangefsdevreqwriteiter() frees op->downcall.trailerbuf with vfree() when copyfromiterfull() fails, but does not clear the pointer before goto Efault. The waiter in doreaddir() is then woken with a negative status and frees the same pointer again on its r < 0 path, causing a deterministic double-free. A client holding /dev/pvfs2-req triggers it by sending a readdir downcall whose declared trailersize exceeds the bytes it supplies.
Clear the pointer after freeing so the readdir-side vfree() becomes a no-op.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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In orangefs_devreq_write_iter(), clear op->downcall.trailer_buf after freeing it with vfree() and before going to Efault, so the readdir-side vfree() becomes a no-op.
Event History
Frequently Asked Questions
Who can trigger this issue?
An attacker needs to hold the /dev/pvfs2-req device and be able to send an OrangeFS readdir downcall. The trigger is a declared trailer_size that is larger than the bytes supplied.
What happens when exploitation is attempted?
The malformed readdir downcall causes copy_from_iter_full() to fail. The trailer buffer is then freed once in orangefs_devreq_write_iter() and freed again by the awakened do_readdir() waiter, producing a deterministic double-free.
What is the fix and what can be done before it is applied?
The fix clears op->downcall.trailer_buf immediately after the initial vfree(), making the later readdir-side free a no-op. If patching is not immediately possible, restrict access to /dev/pvfs2-req to prevent untrusted clients from submitting crafted downcalls.