Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-90088— Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop

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.

在 Linux 内核中，已修复以下漏洞： Bluetooth: RFCOMM: 在 rfcomm_apply_pn() 中验证 MTU，以防止无限循环 rfcomm_apply_pn() 函数在未检查是否为零的情况下，直接接受来自远程 PN（参数协商）帧的 MTU 值。当远程对端发送 MTU 为 0 时，d->mtu 将被设置为 0。这会导致 sendmsg 路径在分片数据时陷入无限循环，因为每个分片的大小均为 min_t(size_t, len, 0) == 0，从而使得剩余长度永不减少。无限分配零长度 skb（

AI Predicted 5.5 Difficulty: Easy EPSS 0.21% · P10

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e7c0aa45ae6c5a338661b23812bfcdef50bf3e96 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cbc2962da99b6b89345267d3aa74b4b573340548 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fc4851ff8dfb505e9a19efcc286712132bbd178d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f561e44261344adadf9d6a6dff31e3af9776d5c6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< aeee917a4878af95f0c63e18c5f22eaf6299c7b8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3988cbb1be501dbff909a2ee024670e3c955a66d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 44c98fd082eafd49d55a8a4077ff488175b2fe24 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-90088

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop rfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter Negotiation) frame without checking for zero. When the remote peer sends an MTU of zero, d->mtu is set to 0. This causes the sendmsg path to enter an infinite loop when fragmenting data, as each fragment has size == min_t(size_t, len, 0) == 0, so the remaining length never decreases. The infinite allocation of zero-length skbs exhausts all system memory. Fix by clamping d->mtu to RFCOMM_DEFAULT_MTU when the negotiated value is zero, consistent with the initial value assigned in rfcomm_dlc_alloc().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e7c0aa45ae6c5a338661b23812bfcdef50bf3e96 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-90088

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-90088

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-90088 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90088

No comments yet

Leave a comment