CVE-2026-74508: Bluetooth: HIDP: reject frames without a transaction header
Vulnerability summary
CVE-2026-74508 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 18.1% of scored vulnerabilities.
Not severe (CVSS 8.8, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 11Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom. KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one. The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds. Pull the transaction header with skb_pull_data() and discard frames that do not contain it.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
Decrease -0.15 pp
From 0.41% on 06-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu169 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 7.0.0-42.42
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 7.0.0-1016.17
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
- linux-6.12< 6.12.107-1~deb12u1
Linux1 product
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 238c333bc4b3f245c626632e8bfa3c9dab97f51b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 97b61241ab45bfa5b0526cb0f3978942493bc811 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2ebf63aa557a69990b4e9ea22be224d58aabce96 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 854194494a6f726a60b90b76059148bf08df023d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 47778d2c2087b5d192398f6fddf692d16a5431cf | 2.6.12
3 vendors · 172 products
