CVE-2026-31393— Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
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I. Basic Information for CVE-2026-31393
Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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，该漏洞源于未验证L2CAP_INFO_RSP有效载荷长度，可能导致越界读取。
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
II. Public POCs for CVE-2026-31393
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Same Patch Batch · Linux · 2026-04-03 · 72 CVEs total
| CVE-2026-31402 | 9.8 CRITICAL | nfsd: fix heap overflow in NFSv4.0 LOCK replay cache |
| CVE-2026-23450 | 9.8 CRITICAL | net/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock() |
| CVE-2026-23427 | 9.8 CRITICAL | ksmbd: fix use-after-free in durable v2 replay of active file handles |
| CVE-2026-23428 | 9.8 CRITICAL | ksmbd: fix use-after-free of share_conf in compound request |
| CVE-2026-23455 | 9.1 CRITICAL | netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() |
| CVE-2026-23461 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user |
| CVE-2026-23425 | 8.8 HIGH | KVM: arm64: Fix ID register initialization for non-protected pKVM guests |
| CVE-2026-23462 | 8.8 HIGH | Bluetooth: HIDP: Fix possible UAF |
| CVE-2026-23457 | 8.6 HIGH | netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() |
| CVE-2026-23456 | 8.2 HIGH | netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case |
| CVE-2026-23459 | 8.2 HIGH | ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS |
| CVE-2026-31392 | 8.1 HIGH | smb: client: fix krb5 mount with username option |
| CVE-2026-31398 | 7.8 HIGH | mm/rmap: fix incorrect pte restoration for lazyfree folios |
| CVE-2026-23432 | 7.8 HIGH | mshv: Fix use-after-free in mshv_map_user_memory error path |
| CVE-2026-31403 | 7.8 HIGH | NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd |
| CVE-2026-23437 | 7.8 HIGH | net: shaper: protect late read accesses to the hierarchy |
| CVE-2026-23458 | 7.8 HIGH | netfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct() |
| CVE-2026-23444 | 7.8 HIGH | wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure |
| CVE-2026-23445 | 7.8 HIGH | igc: fix page fault in XDP TX timestamps handling |
| CVE-2026-23449 | 7.8 HIGH | net/sched: teql: Fix double-free in teql_master_xmit |
Showing top 20 of 72 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-2026-31393
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