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Linux KernelOperating system · Linux

CVE-2024-35909

MEDIUM · 5.5 CVSS v3.1 Published 2024-05-19
Fix available
A fix is available. Upgrade to 6.1.85 / 6.6.26 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: Split 64bit accesses to fix alignment issues Some of the registers are aligned on a 32bit boundary, causing alignment faults on 64bit platforms. Unable to handle kernel paging request at virtual address ffffffc084a1d004 Mem abort info: ESR = 0x0000000096000061 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x21: alignment fault Data abort info: ISV = 0, ISS = 0x00000061, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000046ad6000 [ffffffc084a1d004] pgd=100000013ffff003, p4d=100000013ffff003, pud=100000013ffff003, pmd=0068000020a00711 Internal error: Oops: 0000000096000061 [#1] SMP Modules linked in: mtk_t7xx(+) qcserial pppoe ppp_async option nft_fib_inet nf_flow_table_inet mt7921u(O) mt7921s(O) mt7921e(O) mt7921_common(O) iwlmvm(O) iwldvm(O) usb_wwan rndis_host qmi_wwan pppox ppp_generic nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_redir nft_quota nft_numgen nft_nat nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_chain_nat nf_tables nf_nat nf_flow_table nf_conntrack mt7996e(O) mt792x_usb(O) mt792x_lib(O) mt7915e(O) mt76_usb(O) mt76_sdio(O) mt76_connac_lib(O) mt76(O) mac80211(O) iwlwifi(O) huawei_cdc_ncm cfg80211(O) cdc_ncm cdc_ether wwan usbserial usbnet slhc sfp rtc_pcf8563 nfnetlink nf_reject_ipv6 nf_reject_ipv4 nf_log_syslog nf_defrag_ipv6 nf_defrag_ipv4 mt6577_auxadc mdio_i2c libcrc32c compat(O) cdc_wdm cdc_acm at24 crypto_safexcel pwm_fan i2c_gpio i2c_smbus industrialio i2c_algo_bit i2c_mux_reg i2c_mux_pca954x i2c_mux_pca9541 i2c_mux_gpio i2c_mux dummy oid_registry tun sha512_arm64 sha1_ce sha1_generic seqiv md5 geniv des_generic libdes cbc authencesn authenc leds_gpio xhci_plat_hcd xhci_pci xhci_mtk_hcd xhci_hcd nvme nvme_core gpio_button_hotplug(O) dm_mirror dm_region_hash dm_log dm_crypt dm_mod dax usbcore usb_common ptp aquantia pps_core mii tpm encrypted_keys trusted CPU: 3 PID: 5266 Comm: kworker/u9:1 Tainted: G O 6.6.22 #0 Hardware name: Bananapi BPI-R4 (DT) Workqueue: md_hk_wq t7xx_fsm_uninit [mtk_t7xx] pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : t7xx_cldma_hw_set_start_addr+0x1c/0x3c [mtk_t7xx] lr : t7xx_cldma_start+0xac/0x13c [mtk_t7xx] sp : ffffffc085d63d30 x29: ffffffc085d63d30 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000000000 x25: ffffff80c804f2c0 x24: ffffff80ca196c05 x23: 0000000000000000 x22: ffffff80c814b9b8 x21: ffffff80c814b128 x20: 0000000000000001 x19: ffffff80c814b080 x18: 0000000000000014 x17: 0000000055c9806b x16: 000000007c5296d0 x15: 000000000f6bca68 x14: 00000000dbdbdce4 x13: 000000001aeaf72a x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffffff80ca1ef6b4 x7 : ffffff80c814b818 x6 : 0000000000000018 x5 : 0000000000000870 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 000000010a947000 x1 : ffffffc084a1d004 x0 : ffffffc084a1d004 Call trace: t7xx_cldma_hw_set_start_addr+0x1c/0x3c [mtk_t7xx] t7xx_fsm_uninit+0x578/0x5ec [mtk_t7xx] process_one_work+0x154/0x2a0 worker_thread+0x2ac/0x488 kthread+0xe0/0xec ret_from_fork+0x10/0x20 Code: f9400800 91001000 8b214001 d50332bf (f9000022) ---[ end trace 0000000000000000 ]--- The inclusion of io-64-nonatomic-lo-hi.h indicates that all 64bit accesses can be replaced by pairs of nonatomic 32bit access. Fix alignment by forcing all accesses to be 32bit on 64bit platforms.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.19, < 6.1.85>= 6.2, < 6.6.26>= 6.7, < 6.8.5= 6.9

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.1.85 / 6.6.26 / 6.8.5 or later
Fixed in 6.1.856.6.266.8.5
Vendor patch git.kernel.org →
Recommended fix High confidence

6.1.85, 6.6.26, 6.8.5, or 6.9 (or later) depending on which kernel branch is in use

  1. Upgrade the Linux kernel to version 6.1.85 or later if using the 6.1.x branch
  2. Upgrade the Linux kernel to version 6.6.26 or later if using the 6.6.x branch
  3. Upgrade the Linux kernel to version 6.8.5 or later if using the 6.8.x branch
  4. Upgrade to kernel 6.9 or later if using the 6.9 branch
  5. Reboot the system after applying the kernel update
  6. Ensure the mtk_t7xx module is reloaded or the system has the updated module
Caveat Kernel upgrades may require rebuilding out-of-tree modules (like mtk_t7xx) and could introduce subtle changes to driver behavior; ensure compatibility with user-space tools

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-35909 in production — separate from our analysis above.

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