CyberSecBulletin
CVE-2026-68326NVD status: Received

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-68326 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions a616616b938f7922a93e79bef16b4643c57c0922, 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f, e7e93d3e8c240bdb70c41e79d169d74dfb442843 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.26% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to a616616b938f7922a93e79bef16b4643c57c0922 or 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f or e7e93d3e8c240bdb70c41e79d169d74dfb442843 or a3f47d7c75ddad1a14621a309286f9fae3cba191, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxe568634ae7ac379661c90731d480e067929420a1 up to, but not including, a616616b938f7922a93e79bef16b4643c57c0922; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, e7e93d3e8c240bdb70c41e79d169d74dfb442843; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, a3f47d7c75ddad1a14621a309286f9fae3cba191; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, ad26c75ae25749313248f06510ebe43b5bf4adcc; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, b6766d7ea43edf5de9d5a572bc58b631d09efe4b; e568634ae7ac379661c90731d480e067929420a1 up to, but not including, f0858bfc7d3cab411a447b88e3ef970e575032c9; and 1 more rangesa616616b938f7922a93e79bef16b4643c57c0922, 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f, e7e93d3e8c240bdb70c41e79d169d74dfb442843, a3f47d7c75ddad1a14621a309286f9fae3cba191, ad26c75ae25749313248f06510ebe43b5bf4adcc, d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: bound uAP association event IEs to the event buffer mwifiex_process_uap_event() handles EVENT_UAP_STA_ASSOC by exposing the (re)association request IEs that the firmware copies into the event: sinfo->assoc_req_ies = &event->data[len]; len = (u8 *)sinfo->assoc_req_ies - (u8 *)&event->frame_control; sinfo->assoc_req_ies_len = le16_to_cpu(event->len) - (u16)len; event->len is supplied by the device firmware and is never validated, and the subtraction is unchecked. assoc_req_ies points into adapter->event_body[MAX_EVENT_SIZE], a fixed-size array embedded in the kmalloc()'d struct mwifiex_adapter. On the ap_11n_enabled path mwifiex_set_sta_ht_cap() walks these IEs with cfg80211_find_ie(), whose for_each_element() loop dereferences each element header. A firmware-reported event->len larger than the bytes actually received makes assoc_req_ies_len describe IEs that extend past event_body, so the walk reads out of the adapter slab object, a slab-out-of-bounds read (KASAN: slab-out-of-bounds in cfg80211_find_ie). An event->len smaller than the header instead makes the int subtraction negative, which wraps to a huge size_t when stored in assoc_req_ies_len. The same length is handed to cfg80211_new_sta(), so a more modest over-claim can also copy stale event_body bytes into the NL80211_CMD_NEW_STATION notification. A malicious or malfunctioning mwifiex device (USB/SDIO/PCIe) can deliver such an event while the interface is in AP/uAP mode. Validate event->len before use: reject a length that underflows the header or that would place the IEs outside the event_body[] buffer the event was copied into. event->len here is struct mwifiex_assoc_event.len, a payload field internal to this event, not the transport frame length, so it is validated in this handler rather than at the generic MWIFIEX_TYPE_EVENT receive path, which only sees the event cause and the transport frame length. The bound is against event_body[MAX_EVENT_SIZE] rather than the actually-received length because the transports store the event differently (USB and SDIO leave the 4-byte event header in event_skb, PCIe strips it via skb_pull), whereas event_body is the single fixed buffer all of them copy the event into. This is the event-path analogue of the receive-path bounds checks added in commit 119585281617 ("wifi: mwifiex: Fix OOB and integer underflow when rx packets").

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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