Bluetooth: hci_core: Serialize ACL scheduling with channel deletion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98735
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:27 UTC
Updated2026-10-30 13:21:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Serialize ACL scheduling with channel deletion hci_chan_sent() selects a channel under RCU but drops the read lock before accessing chan->conn and returning the channel. The ACL and LE schedulers then use its packet queue and update its transmit counters without any protection against channel deletion. After TX selects a channel and releases RCU, a disconnect command timeout on the separate request workqueue can run hci_conn_failed() and l2cap_conn_del(). hci_chan_del() can then unlink the channel, complete synchronize_rcu(), purge its queue and free it before TX resumes. This causes use-after-free both in hci_chan_sent() and in its callers. KASAN reported: BUG: KASAN: slab-use-after-free in hci_chan_sent+0x892/0x9b0 Workqueue: hci0 hci_tx_work Call Trace: hci_chan_sent+0x892/0x9b0 hci_tx_work+0x5e6/0xb70 Allocated by task 91: hci_chan_create+0xe3/0x350 l2cap_conn_add.part.0+0x12/0xa30 l2cap_chan_connect+0x110d/0x1b60 l2cap_sock_connect+0x310/0x530 Freed by task 99: hci_chan_del+0x11f/0x170 l2cap_conn_del+0x4f1/0x800 l2cap_connect_cfm+0x88c/0xd30 hci_conn_failed+0x150/0x250 hci_abort_conn_sync+0x3e3/0x800 hci_cmd_sync_run+0x7e/0xc0 hci_abort_conn+0x105/0x1f0 disconnect_sync+0x157/0x290 hci_cmd_sync_work+0x13c/0x290 Hold the existing device mutex across channel selection and transmission in both schedulers to serialize them with channel teardown. Keep timeout handling outside the critical sections because hci_link_tx_to() acquires the same mutex. This also permits the transmit path to sleep, unlike extending the RCU read-side critical section across packet submission.

Risk And Classification

EPSS: 0.001760000 probability, percentile 0.071600000 (date 2026-11-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 126714c495bf31a5e71411b8e0b65a685bb5e58d git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9 git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 74667f6eb7c12b65c56e02e0f527e4099db4ebfd git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 780affacd92977fd9b819bdc4f26a6832cb27fda git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 51f95ea451f25d7e3f048c0f438f04fa74688aae git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da 4fda8f0abeea9929036446d89a476fb8298abcb0 git Not specified
CNA Linux Linux affected 3eff45eaf81780dad25c167bbaafa7d25ae407da f4845ab191a4f686a5da481fbba90ed73bb693b0 git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74667f6eb7c12b65c56e02e0f527e4099db4ebfd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/51f95ea451f25d7e3f048c0f438f04fa74688aae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fda8f0abeea9929036446d89a476fb8298abcb0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/780affacd92977fd9b819bdc4f26a6832cb27fda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f4845ab191a4f686a5da481fbba90ed73bb693b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/126714c495bf31a5e71411b8e0b65a685bb5e58d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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