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Backport privilege escalation security fix for CVE-2025-39698 from linux 6.12.44 #416

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Backport privilege escalation security fix for CVE-2025-39698 from linux 6.12.44 #416

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3 changes: 3 additions & 0 deletions io_uring/futex.c
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Original file line number Diff line number Diff line change
Expand Up @@ -337,6 +337,7 @@ int io_futex_wait(struct io_kiocb *req, unsigned int issue_flags)
goto done_unlock;
}

req->flags |= REQ_F_ASYNC_DATA;
req->async_data = ifd;
ifd->q = futex_q_init;
ifd->q.bitset = iof->futex_mask;
Expand All @@ -359,6 +360,8 @@ int io_futex_wait(struct io_kiocb *req, unsigned int issue_flags)
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, ret, 0);
req->async_data = NULL;
req->flags &= ~REQ_F_ASYNC_DATA;
kfree(ifd);
return IOU_OK;
}
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