CVE-2026-89569: linux
Vulnerability summary
CVE-2026-89569 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 15 · Related 14Timeline
- 11-09-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: serialize security confirmation handling rfcomm_security_cfm() looks up a session on session_list and then walks its DLC list without holding rfcomm_mutex. Since RFCOMM session teardown uses rfcomm_mutex, krfcommd can close and free the same session and DLCs concurrently: hci_rx_work krfcommd ----------- --------- rfcomm_session_get() rfcomm_lock() rfcomm_session_close() rfcomm_dlc_unlink() rfcomm_session_del() kfree(s) rfcomm_unlock() walk s->dlcs The callback can then read a freed session list head and touch freed DLCs while updating their flags or timers. Serialize the session lookup and DLC traversal in rfcomm_security_cfm() with rfcomm_mutex. This matches the existing RFCOMM session lifetime rules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink() from tearing the objects down while the callback is using them. KASAN reported: BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440 Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89 Workqueue: hci0 hci_rx_work Call Trace: rfcomm_security_cfm+0x41c/0x440 hci_encrypt_cfm+0x139/0x590 hci_encrypt_change_evt+0x37b/0xc40 hci_event_packet+0x71b/0xb20 hci_rx_work+0x293/0x730 Allocated by task 69: rfcomm_session_add+0x9e/0x2f0 rfcomm_run+0x44b/0x41e0 Freed by task 69: kfree+0x131/0x3c0 rfcomm_session_del+0x188/0x220 rfcomm_run+0x1985/0x41e0
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
0.34%
Chance of exploitation in the next 30 days
Percentile
27%
Versus all other CVEs
30-day change
+0.01 pp
From 0.34% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu169 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
- linux-6.12< 6.12.111-1~deb12u1
Linux1 product
- linux≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 62ce8b33eb238cf18c15207332fbdc26d858f592 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 3873f3449701b3dc98cba577923be6493598e7a1 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 7ded3264106418c6456ccceaafd9fda596ce12c3 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 82425b14f0fb22e46cfddc56d6465570f5ed0ce6 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 1b7841ffad08e911e8c4b9470f3fa08423568940 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 946d76db77ee5f922968ce558629ae47b381e3fc | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < fbf7961964a6e93360179f64712320ae9a1e9577 | ≥ 08c30aca9e698faddebd34f81e1196295f9dc063, < 759c185d0bbdb131357408f50b8735e04ed3caff | 3.10
3 vendors · 172 products
