CyberSecBulletin
CVE-2026-68353NVD status: Received

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-68353 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.1 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 5297299c3fa6133275db0be99d69cd759b6cbfe9, 35196a07603f8c94a4943093bc26d5b5826285f8, 0e0fc04af9b443c6b425f00fb604ff599bc80d1d 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 0.29% 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 5297299c3fa6133275db0be99d69cd759b6cbfe9 or 35196a07603f8c94a4943093bc26d5b5826285f8 or 0e0fc04af9b443c6b425f00fb604ff599bc80d1d or 69ac7ba3a3df6654e7daa82674575a8c4a1a63ea, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxbdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 5297299c3fa6133275db0be99d69cd759b6cbfe9; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 35196a07603f8c94a4943093bc26d5b5826285f8; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 0e0fc04af9b443c6b425f00fb604ff599bc80d1d; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 69ac7ba3a3df6654e7daa82674575a8c4a1a63ea; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 289edc3c71344b89e6522891147cfb8f61b088bb; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, eb636fbc443149b3501c3f97e26225ddcb314a0f; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, c38b0d5c661951b5dd082bdf31f8a57a0ce6e540; bdcd81707973cf8aa9305337166f8ee842a050d4 up to, but not including, 3a21c89215cc18f1a97c5e5bfd1da6d4f3d44495; and 1 more ranges5297299c3fa6133275db0be99d69cd759b6cbfe9, 35196a07603f8c94a4943093bc26d5b5826285f8, 0e0fc04af9b443c6b425f00fb604ff599bc80d1d, 69ac7ba3a3df6654e7daa82674575a8c4a1a63ea, 289edc3c71344b89e6522891147cfb8f61b088bb, eb636fbc443149b3501c3f97e26225ddcb314a0f

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
NoneNothing can be modified.
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:N/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: fix OOB read from firmware num_msg in TX complete handler The firmware-controlled num_msg field (u8, 0-255) drives the loop in ath6kl_wmi_tx_complete_event_rx() without validation against the buffer length. This allows out-of-bounds reads of up to 1020 bytes past the WMI event buffer when the firmware sends an inflated num_msg. Add a check that the buffer is large enough to hold the fixed struct and the num_msg variable-length entries.

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: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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