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CVE-2022-49908— Bluetooth: L2CAP: Fix memory leak in vhci_write

EPSS 0.05% · P15

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux4d7ea8ee90e42fc75995f6fb24032d3233314528< aa16cac06b752e5f609c106735bd7838f444784caffected
4d7ea8ee90e42fc75995f6fb24032d3233314528< 5b4f039a2f487c5edae681d763fe1af505f84c13affected
4d7ea8ee90e42fc75995f6fb24032d3233314528< 7c9524d929648935bac2bbb4c20437df8f9c3f42affected
5.12affected
< 5.12unaffected
5.15.78≤ 5.15.*unaffected
6.0.8≤ 6.0.*unaffected
6.1≤ *unaffected
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I. Basic Information for CVE-2022-49908

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix memory leak in vhci_write
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix memory leak in vhci_write Syzkaller reports a memory leak as follows: ==================================== BUG: memory leak unreferenced object 0xffff88810d81ac00 (size 240): [...] hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff838733d9>] __alloc_skb+0x1f9/0x270 net/core/skbuff.c:418 [<ffffffff833f742f>] alloc_skb include/linux/skbuff.h:1257 [inline] [<ffffffff833f742f>] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] [<ffffffff833f742f>] vhci_get_user drivers/bluetooth/hci_vhci.c:391 [inline] [<ffffffff833f742f>] vhci_write+0x5f/0x230 drivers/bluetooth/hci_vhci.c:511 [<ffffffff815e398d>] call_write_iter include/linux/fs.h:2192 [inline] [<ffffffff815e398d>] new_sync_write fs/read_write.c:491 [inline] [<ffffffff815e398d>] vfs_write+0x42d/0x540 fs/read_write.c:578 [<ffffffff815e3cdd>] ksys_write+0x9d/0x160 fs/read_write.c:631 [<ffffffff845e0645>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845e0645>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd ==================================== HCI core will uses hci_rx_work() to process frame, which is queued to the hdev->rx_q tail in hci_recv_frame() by HCI driver. Yet the problem is that, HCI core may not free the skb after handling ACL data packets. To be more specific, when start fragment does not contain the L2CAP length, HCI core just copies skb into conn->rx_skb and finishes frame process in l2cap_recv_acldata(), without freeing the skb, which triggers the above memory leak. This patch solves it by releasing the relative skb, after processing the above case in l2cap_recv_acldata().
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Bluetooth L2CAP内存泄漏，可能导致资源耗尽。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4d7ea8ee90e42fc75995f6fb24032d3233314528 ~ aa16cac06b752e5f609c106735bd7838f444784c -
LinuxLinux 5.12 -

II. Public POCs for CVE-2022-49908

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III. Intelligence Information for CVE-2022-49908

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Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total

CVE-2022-49852riscv: process: fix kernel info leakage
CVE-2022-49836siox: fix possible memory leak in siox_device_add()
CVE-2022-49837bpf: Fix memory leaks in __check_func_call
CVE-2022-49838sctp: clear out_curr if all frag chunks of current msg are pruned
CVE-2022-49840bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()
CVE-2022-49839scsi: scsi_transport_sas: Fix error handling in sas_phy_add()
CVE-2022-49841serial: imx: Add missing .thaw_noirq hook
CVE-2022-49842ASoC: core: Fix use-after-free in snd_soc_exit()
CVE-2022-49844can: dev: fix skb drop check
CVE-2022-49845can: j1939: j1939_send_one(): fix missing CAN header initialization
CVE-2022-49846udf: Fix a slab-out-of-bounds write bug in udf_find_entry()
CVE-2022-49847net: ethernet: ti: am65-cpsw: Fix segmentation fault at module unload
CVE-2022-49849btrfs: fix match incorrectly in dev_args_match_device
CVE-2022-49848phy: qcom-qmp-combo: fix NULL-deref on runtime resume
CVE-2022-49850nilfs2: fix deadlock in nilfs_count_free_blocks()
CVE-2022-49851riscv: fix reserved memory setup
CVE-2022-49863can: af_can: fix NULL pointer dereference in can_rx_register()
CVE-2022-49862tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header
CVE-2022-49864drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to_ram()
CVE-2022-49861dmaengine: mv_xor_v2: Fix a resource leak in mv_xor_v2_remove()

Showing top 20 of 245 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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