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CVE-2024-35938— wifi: ath11k: decrease MHI channel buffer length to 8KB

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，该漏洞源于内存高度碎片化，不允许内存压缩或回收。

AI Predicted 5.3 Difficulty: Hard EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux d5c65159f2895379e11ca13f62feabe93278985d< 805a1cdde82fec00c7471a393f4bb437b2741559 affected
d5c65159f2895379e11ca13f62feabe93278985d< 6597a6687af54e2cb58371cf8f6ee4dd85c537de affected
d5c65159f2895379e11ca13f62feabe93278985d< 138fdeac75fb7512a7f9f1c3b236cd2e754af793 affected
d5c65159f2895379e11ca13f62feabe93278985d< ae5876b3b7b2243d874e2afa099e7926122087a1 affected
d5c65159f2895379e11ca13f62feabe93278985d< 1cca1bddf9ef080503c15378cecf4877f7510015 affected
5.6 affected
< 5.6 unaffected
5.15.155≤ 5.15.* unaffected
… +4 more rows
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I. Basic Information for CVE-2024-35938

Vulnerability Information
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Vulnerability Title
wifi: ath11k: decrease MHI channel buffer length to 8KB
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: decrease MHI channel buffer length to 8KB Currently buf_len field of ath11k_mhi_config_qca6390 is assigned with 0, making MHI use a default size, 64KB, to allocate channel buffers. This is likely to fail in some scenarios where system memory is highly fragmented and memory compaction or reclaim is not allowed. There is a fail report which is caused by it: kworker/u32:45: page allocation failure: order:4, mode:0x40c00(GFP_NOIO|__GFP_COMP), nodemask=(null),cpuset=/,mems_allowed=0 CPU: 0 PID: 19318 Comm: kworker/u32:45 Not tainted 6.8.0-rc3-1.gae4495f-default #1 openSUSE Tumbleweed (unreleased) 493b6d5b382c603654d7a81fc3c144d59a1dfceb Workqueue: events_unbound async_run_entry_fn Call Trace: <TASK> dump_stack_lvl+0x47/0x60 warn_alloc+0x13a/0x1b0 ? srso_alias_return_thunk+0x5/0xfbef5 ? __alloc_pages_direct_compact+0xab/0x210 __alloc_pages_slowpath.constprop.0+0xd3e/0xda0 __alloc_pages+0x32d/0x350 ? mhi_prepare_channel+0x127/0x2d0 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] __kmalloc_large_node+0x72/0x110 __kmalloc+0x37c/0x480 ? mhi_map_single_no_bb+0x77/0xf0 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] ? mhi_prepare_channel+0x127/0x2d0 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] mhi_prepare_channel+0x127/0x2d0 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] __mhi_prepare_for_transfer+0x44/0x80 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] ? __pfx_____mhi_prepare_for_transfer+0x10/0x10 [mhi 40df44e07c05479f7a6e7b90fba9f0e0031a7814] device_for_each_child+0x5c/0xa0 ? __pfx_pci_pm_resume+0x10/0x10 ath11k_core_resume+0x65/0x100 [ath11k a5094e22d7223135c40d93c8f5321cf09fd85e4e] ? srso_alias_return_thunk+0x5/0xfbef5 ath11k_pci_pm_resume+0x32/0x60 [ath11k_pci 830b7bfc3ea80ebef32e563cafe2cb55e9cc73ec] ? srso_alias_return_thunk+0x5/0xfbef5 dpm_run_callback+0x8c/0x1e0 device_resume+0x104/0x340 ? __pfx_dpm_watchdog_handler+0x10/0x10 async_resume+0x1d/0x30 async_run_entry_fn+0x32/0x120 process_one_work+0x168/0x330 worker_thread+0x2f5/0x410 ? __pfx_worker_thread+0x10/0x10 kthread+0xe8/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> Actually those buffers are used only by QMI target -> host communication. And for WCN6855 and QCA6390, the largest packet size for that is less than 6KB. So change buf_len field to 8KB, which results in order 1 allocation if page size is 4KB. In this way, we can at least save some memory, and as well as decrease the possibility of allocation failure in those scenarios. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
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，该漏洞源于内存高度碎片化，不允许内存压缩或回收。
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 d5c65159f2895379e11ca13f62feabe93278985d ~ 805a1cdde82fec00c7471a393f4bb437b2741559 -
Linux Linux 5.6 -

II. Public POCs for CVE-2024-35938

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III. Intelligence Information for CVE-2024-35938

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Other References for CVE-2024-35938 (5)

Same Patch Batch · Linux · 2024-05-19 · 82 CVEs total

CVE-2024-35861 9.8 CRITICAL smb: client: fix potential UAF in cifs_signal_cifsd_for_reconnect()
CVE-2024-35869 9.8 CRITICAL smb: client: guarantee refcounted children from parent session
CVE-2024-35870 9.8 CRITICAL smb: client: fix UAF in smb2_reconnect_server()
CVE-2024-35884 9.8 CRITICAL udp: do not accept non-tunnel GSO skbs landing in a tunnel
CVE-2024-35865 9.8 CRITICAL smb: client: fix potential UAF in smb2_is_valid_oplock_break()
CVE-2024-35864 9.8 CRITICAL smb: client: fix potential UAF in smb2_is_valid_lease_break()
CVE-2024-35863 9.8 CRITICAL smb: client: fix potential UAF in is_valid_oplock_break()
CVE-2024-35862 9.8 CRITICAL smb: client: fix potential UAF in smb2_is_network_name_deleted()
CVE-2024-35939 9.3 CRITICAL dma-direct: Leak pages on dma_set_decrypted() failure
CVE-2024-35887 8.8 HIGH ax25: fix use-after-free bugs caused by ax25_ds_del_timer
CVE-2024-35915 8.8 HIGH nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet
CVE-2024-35889 8.6 HIGH idpf: fix kernel panic on unknown packet types
CVE-2024-35875 8.4 HIGH x86/coco: Require seeding RNG with RDRAND on CoCo systems
CVE-2024-35937 8.1 HIGH wifi: cfg80211: check A-MSDU format more carefully
CVE-2024-35921 7.8 HIGH media: mediatek: vcodec: Fix oops when HEVC init fails
CVE-2024-35905 7.8 HIGH bpf: Protect against int overflow for stack access size
CVE-2024-35890 7.8 HIGH gro: fix ownership transfer
CVE-2024-35920 7.8 HIGH media: mediatek: vcodec: adding lock to protect decoder context list
CVE-2024-35919 7.8 HIGH media: mediatek: vcodec: adding lock to protect encoder context list
CVE-2024-35897 7.8 HIGH netfilter: nf_tables: discard table flag update with pending basechain deletion

Showing top 20 of 82 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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