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CVE-2026-53188— RDMA/core: Validate the passed in fops for ib_get_ucaps()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.15版本存在安全漏洞，该漏洞源于RDMA/core中ib_get_ucaps()函数对传入的fops验证不当，可能导致攻击者通过查找具有相同设备号的块设备来伪装成ucap cdev fd。

CVSS 8.8 · High EPSS 0.13% · P3

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 61e51682816d395307f78ae06d640089054c28ab< 96b6e98ff12d50ed5817230c6f1188e1150d225d affected
61e51682816d395307f78ae06d640089054c28ab< aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b affected
61e51682816d395307f78ae06d640089054c28ab< 4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee affected
6.15 affected
< 6.15 unaffected
6.18.36≤ 6.18.* unaffected
7.0.13≤ 7.0.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-53188

Vulnerability Information
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Vulnerability Title
RDMA/core: Validate the passed in fops for ib_get_ucaps()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Validate the passed in fops for ib_get_ucaps() Sashiko pointed out it is not safe to rely only on the devt because char/block alias so if the user finds a block device with the same dev_t it can masquerade as a ucap cdev fd. Test the f_ops to only accept authentic cdevs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.15版本存在安全漏洞，该漏洞源于RDMA/core中ib_get_ucaps()函数对传入的fops验证不当，可能导致攻击者通过查找具有相同设备号的块设备来伪装成ucap cdev fd。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 61e51682816d395307f78ae06d640089054c28ab ~ 96b6e98ff12d50ed5817230c6f1188e1150d225d -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-53188

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III. Intelligence Information for CVE-2026-53188

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Patches & Fixes for CVE-2026-53188 (3)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53200 8.8 HIGH KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53188

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