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CVE-2021-47391— RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests

EPSS 0.02% · P4

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxe51060f08a61965c4dd91516d82fe90617152590< 9a085fa9b7d644a234465091e038c1911e1a4f2aaffected
e51060f08a61965c4dd91516d82fe90617152590< 03d884671572af8bcfbc9e63944c1021efce7589affected
e51060f08a61965c4dd91516d82fe90617152590< 305d568b72f17f674155a2a8275f865f207b3808affected
2.6.18affected
< 2.6.18unaffected
5.10.188≤ 5.10.*unaffected
5.14.10≤ 5.14.*unaffected
5.15≤ *unaffected
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I. Basic Information for CVE-2021-47391

Vulnerability Information
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Vulnerability Title
RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests The FSM can run in a circle allowing rdma_resolve_ip() to be called twice on the same id_priv. While this cannot happen without going through the work, it violates the invariant that the same address resolution background request cannot be active twice. CPU 1 CPU 2 rdma_resolve_addr(): RDMA_CM_IDLE -> RDMA_CM_ADDR_QUERY rdma_resolve_ip(addr_handler) #1 process_one_req(): for #1 addr_handler(): RDMA_CM_ADDR_QUERY -> RDMA_CM_ADDR_BOUND mutex_unlock(&id_priv->handler_mutex); [.. handler still running ..] rdma_resolve_addr(): RDMA_CM_ADDR_BOUND -> RDMA_CM_ADDR_QUERY rdma_resolve_ip(addr_handler) !! two requests are now on the req_list rdma_destroy_id(): destroy_id_handler_unlock(): _destroy_id(): cma_cancel_operation(): rdma_addr_cancel() // process_one_req() self removes it spin_lock_bh(&lock); cancel_delayed_work(&req->work); if (!list_empty(&req->list)) == true ! rdma_addr_cancel() returns after process_on_req #1 is done kfree(id_priv) process_one_req(): for #2 addr_handler(): mutex_lock(&id_priv->handler_mutex); !! Use after free on id_priv rdma_addr_cancel() expects there to be one req on the list and only cancels the first one. The self-removal behavior of the work only happens after the handler has returned. This yields a situations where the req_list can have two reqs for the same "handle" but rdma_addr_cancel() only cancels the first one. The second req remains active beyond rdma_destroy_id() and will use-after-free id_priv once it inevitably triggers. Fix this by remembering if the id_priv has called rdma_resolve_ip() and always cancel before calling it again. This ensures the req_list never gets more than one item in it and doesn't cost anything in the normal flow that never uses this strange error path.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux e51060f08a61965c4dd91516d82fe90617152590 ~ 9a085fa9b7d644a234465091e038c1911e1a4f2a -
LinuxLinux 2.6.18 -

II. Public POCs for CVE-2021-47391

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III. Intelligence Information for CVE-2021-47391

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Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total

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CVE-2023-52747IB/hfi1: Restore allocated resources on failed copyout

Showing top 20 of 361 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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