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CVE-2026-31498

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <900e4db5385ec2cacd372345a80ab9c8e105b3a3, 4.14.200, <9a21a631ee034b1573dce14b572a24943dbfd7ae, 0, <25f420a0d4cfd61d3d23ec4b9c56d9f443d91377, 7.0, 4.19.149, b7d0ca715c1008acd2fc018f02a56fed88f78b75, <4.10, <de37e2655b7abc3f59254c6b72256840f39fc6d5, <042e2cd4bb11e5313b19b87593616524949e4c52, <4.20, <5.7, <=5.10.*, <=6.6.*, 5.4.69, <e7aab23b7df89a3d754a5f0a7d2237548b328bd0, 6.19.11, <=6.19.*, <52667c859fe33f70c2e711cb81bbd505d5eb8e75, <4.5, 5.15.203, 8828622fb9b4201eeb0870587052e3d834cfaf61, b432ea85ab8472763870dd0f2c186130dd36d68c, <5.5, <=6.18.*, 6.6.131, 6.12.80, 5.7, <=*, 5.10.253, <=5.15.*, 4ad03ff6f680681c5f78254e37c4c856fa953629, <9760b83cfd24b38caee663f429011a0dd6064fa9, 6.1.168, <4.15, 6.18.21, 4.9.238, 96298f640104e4cd9a913a6e50b0b981829b94ff, 799263eb37a4f7f6d39334046929c3bc92452a7f, 4.4.238

Description

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.

Gravité et risque d'exploitation

CVE-2026-31498 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 5.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <900e4db5385ec2cacd372345a80ab9c8e105b3a3, 4.14.200, <9a21a631ee034b1573dce14b572a24943dbfd7ae, 0, <25f420a0d4cfd61d3d23ec4b9c56d9f443d91377, 7.0, 4.19.149, b7d0ca715c1008acd2fc018f02a56fed88f78b75, <4.10, <de37e2655b7abc3f59254c6b72256840f39fc6d5, <042e2cd4bb11e5313b19b87593616524949e4c52, <4.20, <5.7, <=5.10.*, <=6.6.*, 5.4.69, <e7aab23b7df89a3d754a5f0a7d2237548b328bd0, 6.19.11, <=6.19.*, <52667c859fe33f70c2e711cb81bbd505d5eb8e75, <4.5, 5.15.203, 8828622fb9b4201eeb0870587052e3d834cfaf61, b432ea85ab8472763870dd0f2c186130dd36d68c, <5.5, <=6.18.*, 6.6.131, 6.12.80, 5.7, <=*, 5.10.253, <=5.15.*, 4ad03ff6f680681c5f78254e37c4c856fa953629, <9760b83cfd24b38caee663f429011a0dd6064fa9, 6.1.168, <4.15, 6.18.21, 4.9.238, 96298f640104e4cd9a913a6e50b0b981829b94ff, 799263eb37a4f7f6d39334046929c3bc92452a7f, 4.4.238) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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