In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7925: prevent NULL pointer dereference in mt7925_sta_set_decap_offload()
Add a NULL check for msta->vif before accessing its members to prevent
a kernel panic in AP mode deployment. This also fix the issue reported
in [1].
The crash occurs when this function is triggered before the station is
fully initialized. The call trace shows a page fault at
mt7925_sta_set_decap_offload() due to accessing resources when msta->vif
is NULL.
Fix this by adding an early return if msta->vif is NULL and also check
wcid.sta is ready. This ensures we only proceed with decap offload
configuration when the station's state is properly initialized.
[14739.655703] Unable to handle kernel paging request at virtual address ffffffffffffffa0
[14739.811820] CPU: 0 UID: 0 PID: 895854 Comm: hostapd Tainted: G
[14739.821394] Tainted: [C]=CRAP, [O]=OOT_MODULE
[14739.825746] Hardware name: Raspberry Pi 4 Model B Rev 1.1 (DT)
[14739.831577] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[14739.838538] pc : mt7925_sta_set_decap_offload+0xc0/0x1b8 [mt7925_common]
[14739.845271] lr : mt7925_sta_set_decap_offload+0x58/0x1b8 [mt7925_common]
[14739.851985] sp : ffffffc085efb500
[14739.855295] x29: ffffffc085efb500 x28: 0000000000000000 x27: ffffff807803a158
[14739.862436] x26: ffffff8041ececb8 x25: 0000000000000001 x24: 0000000000000001
[14739.869577] x23: 0000000000000001 x22: 0000000000000008 x21: ffffff8041ecea88
[14739.876715] x20: ffffff8041c19ca0 x19: ffffff8078031fe0 x18: 0000000000000000
[14739.883853] x17: 0000000000000000 x16: ffffffe2aeac1110 x15: 000000559da48080
[14739.890991] x14: 0000000000000001 x13: 0000000000000000 x12: 0000000000000000
[14739.898130] x11: 0a10020001008e88 x10: 0000000000001a50 x9 : ffffffe26457bfa0
[14739.905269] x8 : ffffff8042013bb0 x7 : ffffff807fb6cbf8 x6 : dead000000000100
[14739.912407] x5 : dead000000000122 x4 : ffffff80780326c8 x3 : 0000000000000000
[14739.919546] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff8041ececb8
[14739.926686] Call trace:
[14739.929130] mt7925_sta_set_decap_offload+0xc0/0x1b8 [mt7925_common]
[14739.935505] ieee80211_check_fast_rx+0x19c/0x510 [mac80211]
[14739.941344] _sta_info_move_state+0xe4/0x510 [mac80211]
[14739.946860] sta_info_move_state+0x1c/0x30 [mac80211]
[14739.952116] sta_apply_auth_flags.constprop.0+0x90/0x1b0 [mac80211]
[14739.958708] sta_apply_parameters+0x234/0x5e0 [mac80211]
[14739.964332] ieee80211_add_station+0xdc/0x190 [mac80211]
[14739.969950] nl80211_new_station+0x46c/0x670 [cfg80211]
[14739.975516] genl_family_rcv_msg_doit+0xdc/0x150
[14739.980158] genl_rcv_msg+0x218/0x298
[14739.983830] netlink_rcv_skb+0x64/0x138
[14739.987670] genl_rcv+0x40/0x60
[14739.990816] netlink_unicast+0x314/0x380
[14739.994742] netlink_sendmsg+0x198/0x3f0
[14739.998664] __sock_sendmsg+0x64/0xc0
[14740.002324] ____sys_sendmsg+0x260/0x298
[14740.006242] ___sys_sendmsg+0xb4/0x110
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it