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CVE-2026-99014

Bluetooth: hci_sync: Fix command skb lifetime during scan setup

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix command skb lifetime during scan setup During PA sync scan setup, hci_le_set_ext_scan_param_sync() gets the address used for the PA_LINK lookup from hci_sent_cmd_data(). The returned pointer borrows storage from sent_cmd or req_skb, without holding a reference to either skb. The scan worker runs on req_workqueue while hci_cmd_work() runs on the separate device workqueue. After the scan worker loads sent_cmd, the command worker can free and replace it before hci_sent_cmd_data() dereferences the skb. The command payload can also be freed between returning from the helper and comparing the address. The connection lookup's RCU critical section does not protect the command skb. KASAN reported: BUG: KASAN: slab-use-after-free in hci_sent_cmd_data+0x27c/0x2f0 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_sent_cmd_data+0x27c/0x2f0 hci_le_set_scan_param_sync+0x43a/0x850 hci_passive_scan_sync+0xb09/0x1460 hci_update_passive_scan_sync+0x47c/0x6e0 hci_le_pa_create_sync+0x200/0xa70 hci_cmd_sync_work+0x13c/0x290 Allocated by task 95: skb_clone+0x13f/0x340 hci_cmd_work+0x2a9/0x7e0 Freed by task 95: kmem_cache_free+0xba/0x3a0 hci_cmd_work+0x29c/0x7e0 Use hdev->lock to serialize the address snapshot with sent_cmd replacement. Protect req_skb replacement and completion cleanup with the same lock because the helper falls back to that skb. Copy the address before releasing the lock and use the copy for the existing RCU-protected connection lookup. Release the mutex before sending or waiting for commands, preserving the lookup and completion ordering.

Timeline

  1. ID reserved

    By Linux

  2. · 28 days later

    Published

  3. · 1 day 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

CVSS scores of CVE-2026-99014, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Received3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (11 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected de3c85d321bfb85b7742a6cfab95d680da3e26b1 – < f01cbddfb4273fcc9a786d13b0a2525029023605
    • affected 22cbf4f84c00da64196eb15034feee868e63eef0 – < 119ba8070b3f112dd36c897f4f70ea5bb7d370b8
    • affected 22cbf4f84c00da64196eb15034feee868e63eef0 – < 7db33b36213a3a1a40940c009ddac30670b55922
    • affected 22cbf4f84c00da64196eb15034feee868e63eef0 – < 762850c203fab1190ad6a3de41cd51920b22236d
    • affected 22cbf4f84c00da64196eb15034feee868e63eef0 – < 9af12272061d206af8bc3e40215cb694421ab73a
    • affected 7a54f8314584f78fb0557153b1059924249ef628
    • affected 6.6.28 – < 6.6.160
    • affected 6.8.7 – < 6.9

  • Linux · Linux

    • affected 6.9
    • unaffected < 6.9
    • unaffected 6.6.160 – ≤ 6.6.*
    • unaffected 6.12.114 – ≤ 6.12.*
    • unaffected 6.18.57 – ≤ 6.18.*
    • unaffected 7.2.11 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

References5

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .