CVE-2026-31393Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4e8402a3f884427f9233ba436459c158d1f2e114 before 187e6fe939295be36063a1d91f8bebee04399a8c; from 4e8402a3f884427f9233ba436459c158d1f2e114 before 5229e7d15771eac2b5886bfb1f976aea0c1eec14; 4e8402a3f884427f9233ba436459c158d1f2e114 builds before 3b646516cba2ebc4b51a72954903326e7c1e443f; from 4e8402a3f884427f9233ba436459c158d1f2e114 before 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0; from 4e8402a3f884427f9233ba436459c158d1f2e114 before 9aeacde4da0f02d42fd968fd32f245828b230171; from 4e8402a3f884427f9233ba436459c158d1f2e114 before e7ff754e339e3d5ce29aa9f95352d0186df8fbd9; from 4e8402a3f884427f9233ba436459c158d1f2e114 before db2872d054e467810078e2b9f440a5b326a601b2; from 4e8402a3f884427f9233ba436459c158d1f2e114 before dd815e6e3918dc75a49aaabac36e4f024d675101 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.24 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8cpatch
- https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14patch
- https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443fpatch
- https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0patch
- https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171patch
- https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9patch
- https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2patch
- https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.