CVE-2026-31499— Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
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I. Basic Information for CVE-2026-31499
Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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l2cap_conn_del函数锁顺序不当，可能导致死锁。
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
II. Public POCs for CVE-2026-31499
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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 → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-31499
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