CVE-2026-31393Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
- 8.1HighCVSS base score
- 0.27%Exploitation in 30 daysEPSS · top 81% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.
Timeline
ID reserved
By Linux
- 25 days later
· 25 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.27% · top 81% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < 187e6fe939295be36063a1d91f8bebee04399a8c
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < 5229e7d15771eac2b5886bfb1f976aea0c1eec14
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < 3b646516cba2ebc4b51a72954903326e7c1e443f
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < 9aeacde4da0f02d42fd968fd32f245828b230171
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < e7ff754e339e3d5ce29aa9f95352d0186df8fbd9
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < db2872d054e467810078e2b9f440a5b326a601b2
- affected 4e8402a3f884427f9233ba436459c158d1f2e114 – < dd815e6e3918dc75a49aaabac36e4f024d675101
- affected 2.6.24
- unaffected < 2.6.24
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c (opens in a new tab)
- https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14 (opens in a new tab)
- https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f (opens in a new tab)
- https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 (opens in a new tab)
- https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171 (opens in a new tab)
- https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 (opens in a new tab)
- https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2 (opens in a new tab)
- https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-18768 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-31393)Record last updated .