CVE-2026-31498 (GCVE-0-2026-31498)
Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54
VLAI?
Title
Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop
l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED
state to support L2CAP reconfiguration (e.g. MTU changes). However,
since both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from
the initial configuration, the reconfiguration path falls through to
l2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and
retrans_list without freeing the previous allocations and sets
chan->sdu to NULL without freeing the existing skb. This leaks all
previously allocated ERTM resources.
Additionally, l2cap_parse_conf_req() does not validate the minimum
value of remote_mps derived from the RFC max_pdu_size option. A zero
value propagates to l2cap_segment_sdu() where pdu_len becomes zero,
causing the while loop to never terminate since len is never
decremented, exhausting all available memory.
Fix the double-init by skipping l2cap_ertm_init() and
l2cap_chan_ready() when the channel is already in BT_CONNECTED state,
while still allowing the reconfiguration parameters to be updated
through l2cap_parse_conf_req(). Also add a pdu_len zero check in
l2cap_segment_sdu() as a safeguard.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
96298f640104e4cd9a913a6e50b0b981829b94ff , < 9760b83cfd24b38caee663f429011a0dd6064fa9
(git)
Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < de37e2655b7abc3f59254c6b72256840f39fc6d5 (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < e7aab23b7df89a3d754a5f0a7d2237548b328bd0 (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < 52667c859fe33f70c2e711cb81bbd505d5eb8e75 (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < 9a21a631ee034b1573dce14b572a24943dbfd7ae (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < 900e4db5385ec2cacd372345a80ab9c8e105b3a3 (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < 042e2cd4bb11e5313b19b87593616524949e4c52 (git) Affected: 96298f640104e4cd9a913a6e50b0b981829b94ff , < 25f420a0d4cfd61d3d23ec4b9c56d9f443d91377 (git) Affected: 4ad03ff6f680681c5f78254e37c4c856fa953629 (git) Affected: b7d0ca715c1008acd2fc018f02a56fed88f78b75 (git) Affected: 799263eb37a4f7f6d39334046929c3bc92452a7f (git) Affected: 8828622fb9b4201eeb0870587052e3d834cfaf61 (git) Affected: b432ea85ab8472763870dd0f2c186130dd36d68c (git) |
|||||||
|
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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