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CVE-2026-53256— Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()

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 2.6.12版本存在安全漏洞，该漏洞源于在RFCOMM协议中，监听套接字未进行引用计数，可能导致竞争条件从而引发释放后重用。

CVSS 8.0 · High EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f5ec76bdbeb80f75ad0be204371afffee0f8fac8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a07d741c077d4e34b16458241a94d29039386553 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1f73f92f66251065a5f39b09a47cf05ea14d3107 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< de31973ef00e5aa55496f84cf6a44bb157a34e02 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b0e33e409715c617e2a20f46f99aa5403a14dfda affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8802413ce63175fb522a2bd609fb043a3550c720 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6f4462d12133106460d7c046b95aad2491e3fddf affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 43c441edacf953b39517a44f5e5e10a93618b226 affected
… +10 more rows
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I. Basic Information for CVE-2026-53256

Vulnerability Information
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Vulnerability Title
Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() rfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock, but returns the selected listener after dropping that lock without taking a reference. rfcomm_connect_ind() then locks the listener, queues a child socket on it, and may notify it after unlocking it. The buggy scenario involves two paths, with each column showing the order within that path: rfcomm_connect_ind(): listener close: 1. Find parent in 1. close() enters rfcomm_get_sock_by_channel() rfcomm_sock_release(). 2. Drop rfcomm_sk_list.lock 2. rfcomm_sock_shutdown() without pinning parent. closes the listener. 3. Call lock_sock(parent) and 3. rfcomm_sock_kill() bt_accept_enqueue(parent, unlinks and puts parent. sk, true). 4. Read parent flags and may 4. parent can be freed. call sk_state_change(). If close wins the race, parent can be freed before rfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the deferred-setup callback. Take a reference on the listener before leaving rfcomm_sk_list.lock. After lock_sock() succeeds, recheck that it is still in BT_LISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use. KASAN reported a slab-use-after-free in lock_sock_nested() from rfcomm_connect_ind(), with the freeing stack going through rfcomm_sock_kill() and rfcomm_sock_release().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/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 2.6.12版本存在安全漏洞，该漏洞源于在RFCOMM协议中，监听套接字未进行引用计数，可能导致竞争条件从而引发释放后重用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ f5ec76bdbeb80f75ad0be204371afffee0f8fac8 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-53256

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III. Intelligence Information for CVE-2026-53256

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Patches & Fixes for CVE-2026-53256 (8)

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-2026-53256

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