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CVE-2026-31498— Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len 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.

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L2CAP中ERTM重新初始化和零pdu_len验证不足，可能导致资源泄漏和无限循环。

AI Predicted 7.5 Difficulty: Easy EPSS 0.16% · P5

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 96298f640104e4cd9a913a6e50b0b981829b94ff< 9760b83cfd24b38caee663f429011a0dd6064fa9 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< de37e2655b7abc3f59254c6b72256840f39fc6d5 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< e7aab23b7df89a3d754a5f0a7d2237548b328bd0 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< 52667c859fe33f70c2e711cb81bbd505d5eb8e75 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< 9a21a631ee034b1573dce14b572a24943dbfd7ae affected
96298f640104e4cd9a913a6e50b0b981829b94ff< 900e4db5385ec2cacd372345a80ab9c8e105b3a3 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< 042e2cd4bb11e5313b19b87593616524949e4c52 affected
96298f640104e4cd9a913a6e50b0b981829b94ff< 25f420a0d4cfd61d3d23ec4b9c56d9f443d91377 affected
… +20 more rows
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I. Basic Information for CVE-2026-31498

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED state to support L2CAP reconfiguration (e.g. MTU changes). However, since both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from the initial configuration, the reconfiguration path falls through to l2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and retrans_list without freeing the previous allocations and sets chan->sdu to NULL without freeing the existing skb. This leaks all previously allocated ERTM resources. Additionally, l2cap_parse_conf_req() does not validate the minimum value of remote_mps derived from the RFC max_pdu_size option. A zero value propagates to l2cap_segment_sdu() where pdu_len becomes zero, causing the while loop to never terminate since len is never decremented, exhausting all available memory. Fix the double-init by skipping l2cap_ertm_init() and l2cap_chan_ready() when the channel is already in BT_CONNECTED state, while still allowing the reconfiguration parameters to be updated through l2cap_parse_conf_req(). Also add a pdu_len zero check in l2cap_segment_sdu() as a safeguard.
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
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L2CAP中ERTM重新初始化和零pdu_len验证不足，可能导致资源泄漏和无限循环。
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 96298f640104e4cd9a913a6e50b0b981829b94ff ~ 9760b83cfd24b38caee663f429011a0dd6064fa9 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-31498

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III. Intelligence Information for CVE-2026-31498

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31433 8.8 HIGH ksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31464 8.1 HIGH scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31449 7.8 HIGH ext4: validate p_idx bounds in ext4_ext_correct_indexes
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31431 7.8 HIGH crypto: algif_aead - Revert to operating out-of-place
CVE-2026-31488 7.8 HIGH drm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-31490 7.8 HIGH drm/xe/pf: Fix use-after-free in migration restore
CVE-2026-31454 7.8 HIGH xfs: save ailp before dropping the AIL lock in push callbacks

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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