CVE-2026-31498 (GCVE-0-2026-31498)
Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-11-05 21:45
VLAI
EPSS
VEX
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.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:35 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) Affected: 4.4.238 , < 4.5 (semver) Affected: 4.9.238 , < 4.10 (semver) Affected: 4.14.200 , < 4.15 (semver) Affected: 4.19.149 , < 4.20 (semver) Affected: 5.4.69 , < 5.5 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.7
Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-31498",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-05T21:35:45.390526Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-11-05T21:45:03.103Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9760b83cfd24b38caee663f429011a0dd6064fa9",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "de37e2655b7abc3f59254c6b72256840f39fc6d5",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "e7aab23b7df89a3d754a5f0a7d2237548b328bd0",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "52667c859fe33f70c2e711cb81bbd505d5eb8e75",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "9a21a631ee034b1573dce14b572a24943dbfd7ae",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "900e4db5385ec2cacd372345a80ab9c8e105b3a3",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "042e2cd4bb11e5313b19b87593616524949e4c52",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "25f420a0d4cfd61d3d23ec4b9c56d9f443d91377",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"status": "affected",
"version": "4ad03ff6f680681c5f78254e37c4c856fa953629",
"versionType": "git"
},
{
"status": "affected",
"version": "b7d0ca715c1008acd2fc018f02a56fed88f78b75",
"versionType": "git"
},
{
"status": "affected",
"version": "799263eb37a4f7f6d39334046929c3bc92452a7f",
"versionType": "git"
},
{
"status": "affected",
"version": "8828622fb9b4201eeb0870587052e3d834cfaf61",
"versionType": "git"
},
{
"status": "affected",
"version": "b432ea85ab8472763870dd0f2c186130dd36d68c",
"versionType": "git"
},
{
"lessThan": "4.5",
"status": "affected",
"version": "4.4.238",
"versionType": "semver"
},
{
"lessThan": "4.10",
"status": "affected",
"version": "4.9.238",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.200",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.149",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.69",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"lessThan": "5.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.253",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.168",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.131",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.80",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.21",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.11",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.14.200",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19.149",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4.69",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop\n\nl2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED\nstate to support L2CAP reconfiguration (e.g. MTU changes). However,\nsince both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from\nthe initial configuration, the reconfiguration path falls through to\nl2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and\nretrans_list without freeing the previous allocations and sets\nchan-\u003esdu to NULL without freeing the existing skb. This leaks all\npreviously allocated ERTM resources.\n\nAdditionally, l2cap_parse_conf_req() does not validate the minimum\nvalue of remote_mps derived from the RFC max_pdu_size option. A zero\nvalue propagates to l2cap_segment_sdu() where pdu_len becomes zero,\ncausing the while loop to never terminate since len is never\ndecremented, exhausting all available memory.\n\nFix the double-init by skipping l2cap_ertm_init() and\nl2cap_chan_ready() when the channel is already in BT_CONNECTED state,\nwhile still allowing the reconfiguration parameters to be updated\nthrough l2cap_parse_conf_req(). Also add a pdu_len zero check in\nl2cap_segment_sdu() as a safeguard."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T16:05:11.217Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9"
},
{
"url": "https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5"
},
{
"url": "https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0"
},
{
"url": "https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75"
},
{
"url": "https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae"
},
{
"url": "https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3"
},
{
"url": "https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52"
},
{
"url": "https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"
}
],
"title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31498",
"datePublished": "2026-04-22T13:54:19.714Z",
"dateReserved": "2026-03-09T15:48:24.103Z",
"dateUpdated": "2026-11-05T21:45:03.103Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-31498",
"date": "2026-11-12",
"epss": "0.00123",
"percentile": "0.02043"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T01:53:20.000Z",
"cve": "CVE-2026-31498",
"id": "msrc_CVE-2026-31498",
"initial_release_date": "2026-04-23T01:09:11.000Z",
"product_status:known_affected": "2",
"product_status:known_not_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31498.json",
"version": "6"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9760b83cfd24b38caee663f429011a0dd6064fa9",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "de37e2655b7abc3f59254c6b72256840f39fc6d5",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "e7aab23b7df89a3d754a5f0a7d2237548b328bd0",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "52667c859fe33f70c2e711cb81bbd505d5eb8e75",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "9a21a631ee034b1573dce14b572a24943dbfd7ae",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "900e4db5385ec2cacd372345a80ab9c8e105b3a3",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "042e2cd4bb11e5313b19b87593616524949e4c52",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "25f420a0d4cfd61d3d23ec4b9c56d9f443d91377",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"status": "affected",
"version": "4ad03ff6f680681c5f78254e37c4c856fa953629",
"versionType": "git"
},
{
"status": "affected",
"version": "b7d0ca715c1008acd2fc018f02a56fed88f78b75",
"versionType": "git"
},
{
"status": "affected",
"version": "799263eb37a4f7f6d39334046929c3bc92452a7f",
"versionType": "git"
},
{
"status": "affected",
"version": "8828622fb9b4201eeb0870587052e3d834cfaf61",
"versionType": "git"
},
{
"status": "affected",
"version": "b432ea85ab8472763870dd0f2c186130dd36d68c",
"versionType": "git"
},
{
"lessThan": "4.5",
"status": "affected",
"version": "4.4.238",
"versionType": "semver"
},
{
"lessThan": "4.10",
"status": "affected",
"version": "4.9.238",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.200",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.149",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.69",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"lessThan": "5.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "06D736F2-3AF9-405C-A2D4-D7A433966CD1",
"versionEndExcluding": "4.5",
"versionStartIncluding": "4.4.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C239C4E4-A9BE-4BA4-B0ED-58C96D32A965",
"versionEndExcluding": "4.10",
"versionStartIncluding": "4.9.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E4C219D0-2F4C-4842-85C7-5EE4D0099F82",
"versionEndExcluding": "4.15",
"versionStartIncluding": "4.14.200",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "22D98FED-AEF1-4722-8A24-E84AEFBAE267",
"versionEndExcluding": "4.20",
"versionStartIncluding": "4.19.149",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "20BCB29D-C30A-4880-8FC2-2468E283C95D",
"versionEndExcluding": "5.5",
"versionStartIncluding": "5.4.69",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "44827F4D-4242-412D-B59A-6D9F5FC547B1",
"versionEndExcluding": "5.10.253",
"versionStartIncluding": "5.7.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B",
"versionEndExcluding": "6.1.168",
"versionStartIncluding": "5.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CE6ED4D4-0046-4573-BFA9-D64143B6A89F",
"versionEndExcluding": "6.6.131",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6",
"versionEndExcluding": "6.12.80",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE",
"versionEndExcluding": "6.18.21",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7",
"versionEndExcluding": "6.19.11",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*",
"matchCriteriaId": "3D23CE42-BDB2-4216-8495-230ABE98FCDD",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
"matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
"matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
"matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
"matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
"matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*",
"matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop\n\nl2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED\nstate to support L2CAP reconfiguration (e.g. MTU changes). However,\nsince both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from\nthe initial configuration, the reconfiguration path falls through to\nl2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and\nretrans_list without freeing the previous allocations and sets\nchan-\u003esdu to NULL without freeing the existing skb. This leaks all\npreviously allocated ERTM resources.\n\nAdditionally, l2cap_parse_conf_req() does not validate the minimum\nvalue of remote_mps derived from the RFC max_pdu_size option. A zero\nvalue propagates to l2cap_segment_sdu() where pdu_len becomes zero,\ncausing the while loop to never terminate since len is never\ndecremented, exhausting all available memory.\n\nFix the double-init by skipping l2cap_ertm_init() and\nl2cap_chan_ready() when the channel is already in BT_CONNECTED state,\nwhile still allowing the reconfiguration parameters to be updated\nthrough l2cap_parse_conf_req(). Also add a pdu_len zero check in\nl2cap_segment_sdu() as a safeguard."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Correcci\u00f3n de la reinicializaci\u00f3n de ERTM y bucle infinito con pdu_len cero\n\nl2cap_config_req() procesa CONFIG_REQ para canales en estado BT_CONNECTED para soportar la reconfiguraci\u00f3n de L2CAP (p. ej., cambios de MTU). Sin embargo, dado que tanto CONF_INPUT_DONE como CONF_OUTPUT_DONE ya est\u00e1n establecidos desde la configuraci\u00f3n inicial, la ruta de reconfiguraci\u00f3n pasa a l2cap_ertm_init(), que reinicializa tx_q, srej_q, srej_list y retrans_list sin liberar las asignaciones anteriores y establece chan -\u003e sdu a NULL sin liberar el skb existente. Esto fuga todos los recursos ERTM previamente asignados.\n\nAdem\u00e1s, l2cap_parse_conf_req() no valida el valor m\u00ednimo de remote_mps derivado de la opci\u00f3n max_pdu_size de RFC. Un valor cero se propaga a l2cap_segment_sdu() donde pdu_len se vuelve cero, haciendo que el bucle \u2019while\u2019 nunca termine ya que \u2019len\u2019 nunca se decrementa, agotando toda la memoria disponible.\n\nSe corrige la doble inicializaci\u00f3n omitiendo l2cap_ertm_init() y l2cap_chan_ready() cuando el canal ya est\u00e1 en estado BT_CONNECTED, mientras se sigue permitiendo que los par\u00e1metros de reconfiguraci\u00f3n se actualicen a trav\u00e9s de l2cap_parse_conf_req(). Tambi\u00e9n se a\u00f1ade una comprobaci\u00f3n de pdu_len cero en l2cap_segment_sdu() como salvaguarda."
}
],
"id": "CVE-2026-31498",
"lastModified": "2026-11-11T23:10:00.263",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-31498",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-05T21:35:45.390526Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-22T14:16:48.067",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-07T04:17:53+00:00",
"cve": "CVE-2026-31498",
"id": "CVE-2026-31498",
"initial_release_date": "2026-04-22T00:00:00+00:00",
"product_status:known_affected": "186",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31498.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-31498",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-05T21:35:45.390526Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-11-05T21:35:46.975Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9760b83cfd24b38caee663f429011a0dd6064fa9",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "de37e2655b7abc3f59254c6b72256840f39fc6d5",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "e7aab23b7df89a3d754a5f0a7d2237548b328bd0",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "52667c859fe33f70c2e711cb81bbd505d5eb8e75",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "9a21a631ee034b1573dce14b572a24943dbfd7ae",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "900e4db5385ec2cacd372345a80ab9c8e105b3a3",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "042e2cd4bb11e5313b19b87593616524949e4c52",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"lessThan": "25f420a0d4cfd61d3d23ec4b9c56d9f443d91377",
"status": "affected",
"version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
"versionType": "git"
},
{
"status": "affected",
"version": "4ad03ff6f680681c5f78254e37c4c856fa953629",
"versionType": "git"
},
{
"status": "affected",
"version": "b7d0ca715c1008acd2fc018f02a56fed88f78b75",
"versionType": "git"
},
{
"status": "affected",
"version": "799263eb37a4f7f6d39334046929c3bc92452a7f",
"versionType": "git"
},
{
"status": "affected",
"version": "8828622fb9b4201eeb0870587052e3d834cfaf61",
"versionType": "git"
},
{
"status": "affected",
"version": "b432ea85ab8472763870dd0f2c186130dd36d68c",
"versionType": "git"
},
{
"lessThan": "4.5",
"status": "affected",
"version": "4.4.238",
"versionType": "semver"
},
{
"lessThan": "4.10",
"status": "affected",
"version": "4.9.238",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.200",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.149",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.69",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"lessThan": "5.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.253",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.168",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.131",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.80",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.21",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.11",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.14.200",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19.149",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4.69",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop\n\nl2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED\nstate to support L2CAP reconfiguration (e.g. MTU changes). However,\nsince both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from\nthe initial configuration, the reconfiguration path falls through to\nl2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and\nretrans_list without freeing the previous allocations and sets\nchan-\u003esdu to NULL without freeing the existing skb. This leaks all\npreviously allocated ERTM resources.\n\nAdditionally, l2cap_parse_conf_req() does not validate the minimum\nvalue of remote_mps derived from the RFC max_pdu_size option. A zero\nvalue propagates to l2cap_segment_sdu() where pdu_len becomes zero,\ncausing the while loop to never terminate since len is never\ndecremented, exhausting all available memory.\n\nFix the double-init by skipping l2cap_ertm_init() and\nl2cap_chan_ready() when the channel is already in BT_CONNECTED state,\nwhile still allowing the reconfiguration parameters to be updated\nthrough l2cap_parse_conf_req(). Also add a pdu_len zero check in\nl2cap_segment_sdu() as a safeguard."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T16:05:11.217Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9"
},
{
"url": "https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5"
},
{
"url": "https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0"
},
{
"url": "https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75"
},
{
"url": "https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae"
},
{
"url": "https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3"
},
{
"url": "https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52"
},
{
"url": "https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"
}
],
"title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31498",
"datePublished": "2026-04-22T13:54:19.714Z",
"dateReserved": "2026-03-09T15:48:24.103Z",
"dateUpdated": "2026-11-05T21:45:03.103Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.