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CVE-2026-31498: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 96298f640104e4cd9a913a6e50b0b981829b94ff преди 9760b83cfd24b38caee663f429011a0dd6064fa9; 96298f640104e4cd9a913a6e50b0b981829b94ff преди de37e2655b7abc3f59254c6b72256840f39fc6d5; 96298f640104e4cd9a913a6e50b0b981829b94ff преди e7aab23b7df89a3d754a5f0a7d2237548b328bd0; 96298f640104e4cd9a913a6e50b0b981829b94ff преди 52667c859fe33f70c2e711cb81bbd505d5eb8e75; 96298f640104e4cd9a913a6e50b0b981829b94ff преди 9a21a631ee034b1573dce14b572a24943dbfd7ae; 96298f640104e4cd9a913a6e50b0b981829b94ff преди 900e4db5385ec2cacd372345a80ab9c8e105b3a3; 96298f640104e4cd9a913a6e50b0b981829b94ff преди 042e2cd4bb11e5313b19b87593616524949e4c52; 96298f640104e4cd9a913a6e50b0b981829b94ff преди 25f420a0d4cfd61d3d23ec4b9c56d9f443d91377; 4ad03ff6f680681c5f78254e37c4c856fa953629; b7d0ca715c1008acd2fc018f02a56fed88f78b75; 799263eb37a4f7f6d39334046929c3bc92452a7f; 8828622fb9b4201eeb0870587052e3d834cfaf61; b432ea85ab8472763870dd0f2c186130dd36d68c; 4.4.238 преди 4.5; 4.9.238 преди 4.10; 4.14.200 преди 4.15; 4.19.149 преди 4.20; 5.4.69 преди 5.5
    • Linux Linux: 5.7; преди 5.7; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.131 до 6.6.*; 6.12.80 до 6.12.*; 6.18.21 до 6.18.*; 6.19.11 до 6.19.*; 7.0 до *

    История

    • 22 април 2026 Публикувано

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    CVE-2026-31498: Linux | freedomonline.bg