CyberSecBulletin
CVE-2026-46307NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-46307 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.3 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 ecb1c163166759dec004c1fdb9709b8a5992fc8e, 9dd6aae4bc7bfa11088d928670a3315eae542769, 744c19e266b0d2628c5951439195dcef27eadacf 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 0.24% 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 ecb1c163166759dec004c1fdb9709b8a5992fc8e or 9dd6aae4bc7bfa11088d928670a3315eae542769 or 744c19e266b0d2628c5951439195dcef27eadacf or 83226c71af53fb9b3cad40cb9a9a79f36d68c020, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.140, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, ecb1c163166759dec004c1fdb9709b8a5992fc8e; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, 9dd6aae4bc7bfa11088d928670a3315eae542769; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, 744c19e266b0d2628c5951439195dcef27eadacf; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, 83226c71af53fb9b3cad40cb9a9a79f36d68c020; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, d6869537013b1f21b292342752d97868b79b5934; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, e9f1081bc775146156def0dbc821b92f35d56afb; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, 568173ad9bd0b46cc6cd937dea8791e9b5eefa57; 6d7b97b23e114c8fbb825e6721164d228c1af3fc up to, but not including, d748603f12baff112caa3ab7d39f50100f010dbd; and 1 more rangesecb1c163166759dec004c1fdb9709b8a5992fc8e, 9dd6aae4bc7bfa11088d928670a3315eae542769, 744c19e266b0d2628c5951439195dcef27eadacf, 83226c71af53fb9b3cad40cb9a9a79f36d68c020, d6869537013b1f21b292342752d97868b79b5934, e9f1081bc775146156def0dbc821b92f35d56afb
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel3.0 up to, but not including, 5.10.258; 5.11 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.88; 6.13 up to, but not including, 6.18.30; 6.19 up to, but not including, 7.0.7; 7.15.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30

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
LowPerformance or availability is reduced.

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

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath5k: do not access array OOB Vincent reports: > The ath5k driver seems to do an array-index-out-of-bounds access as > shown by the UBSAN kernel message: > UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath5k/base.c:1741:20 > index 4 is out of range for type 'ieee80211_tx_rate [4]' > ... > Call Trace: > <TASK> > dump_stack_lvl+0x5d/0x80 > ubsan_epilogue+0x5/0x2b > __ubsan_handle_out_of_bounds.cold+0x46/0x4b > ath5k_tasklet_tx+0x4e0/0x560 [ath5k] > tasklet_action_common+0xb5/0x1c0 It is real. 'ts->ts_final_idx' can be 3 on 5212, so: info->status.rates[ts->ts_final_idx + 1].idx = -1; with the array defined as: struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES]; while the size is: #define IEEE80211_TX_MAX_RATES 4 is indeed bogus. Set this 'idx = -1' sentinel only if the array index is less than the array size. As mac80211 will not look at rates beyond the size (IEEE80211_TX_MAX_RATES). Note: The effect of the OOB write is negligible. It just overwrites the next member of info->status, i.e. ack_signal.

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

References

Recent Out-of-bounds Read vulnerabilities

Spotted an error? Tell us.