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CVE-2026-53254— Bluetooth: RFCOMM: validate skb length in MCC handlers

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存在安全漏洞，该漏洞源于RFCOMM MCC处理器在未验证skb长度的情况下转换skb->数据到协议特定结构，可能导致恶意远程设备发送截断的MCC帧并触发越界读取。

CVSS 8.1 · High EPSS 0.27% · P19

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7c15c7c2878957cbfed93bcc29c13fdace464254 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0d637136ce89f9a2309b2c3502402ce400dab0ef affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 98377e6b1a1a56561ec66a181573ea2b61b2079e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3eabc6d47a0ad22b053329997aaf0ec1e581e392 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 23882b828c3c8c51d0c946446a396b10abb3b16b affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-53254

Vulnerability Information
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Vulnerability Title
Bluetooth: RFCOMM: validate skb length in MCC handlers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers. Fix this by using skb_pull_data() to validate and access the required data before dereferencing it. rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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存在安全漏洞，该漏洞源于RFCOMM MCC处理器在未验证skb长度的情况下转换skb->数据到协议特定结构，可能导致恶意远程设备发送截断的MCC帧并触发越界读取。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 7c15c7c2878957cbfed93bcc29c13fdace464254 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-53254

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III. Intelligence Information for CVE-2026-53254

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Patches & Fixes for CVE-2026-53254 (7)

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

CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
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-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53277 8.8 HIGH KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
CVE-2026-53266 8.8 HIGH netfilter: bridge: make ebt_snat ARP rewrite writable
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53275 8.8 HIGH ipv6: mcast: Fix use-after-free when processing MLD queries

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-2026-53254

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