CVE-2026-74533— Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero
Possible ATT&CK Techniques 1AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | dc26097bdb864a0d5955b9a25e43376ffc1af99b< 876a3e94c70d0859d1dad1c986112d4f0d99eba8 | affected |
dc26097bdb864a0d5955b9a25e43376ffc1af99b< af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c | affected | ||
f53e7489273dc2bb307bf50f319b3762d45534f0 | affected | ||
a58d0f5dac322e16cc75334d000666512341bde5 | affected | ||
6.11.11< 6.12 | affected | ||
6.12.2< 6.13 | affected | ||
6.13 | affected | ||
< 6.13 | unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-74533
Vulnerability Information
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Vulnerability Title
Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */ and also to races in iso_conn_add() vs. iso_conn_free(). Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-74533
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-74533 (2)
Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total
| CVE-2026-72421 | 10.0 CRITICAL | ipv4: fib: Don't ignore error route in local/main tables. |
| CVE-2026-74279 | 10.0 CRITICAL | crypto: cavium/cpt - fix DMA cleanup using wrong loop index |
| CVE-2026-74475 | 10.0 CRITICAL | vxlan: use neigh_ha_snapshot() in route_shortcircuit() |
| CVE-2026-74280 | 10.0 CRITICAL | crypto: marvell/octeontx - fix DMA cleanup using wrong loop index |
| CVE-2026-74309 | 10.0 CRITICAL | vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler |
| CVE-2026-72408 | 10.0 CRITICAL | geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint |
| CVE-2026-72407 | 10.0 CRITICAL | geneve: validate inner network offset in geneve_gro_complete() |
| CVE-2026-72493 | 9.9 CRITICAL | net: serialize netif_running() check in enqueue_to_backlog() |
| CVE-2026-72436 | 9.8 CRITICAL | netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types |
| CVE-2026-72422 | 9.8 CRITICAL | ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE |
| CVE-2026-74433 | 9.8 CRITICAL | rxrpc: Fix UAF in rxgk_issue_challenge() |
| CVE-2026-72139 | 9.8 CRITICAL | tcp: defer md5sig_info kfree past RCU grace period in tcp_connect |
| CVE-2026-72065 | 9.8 CRITICAL | net: mana: Validate the packet length reported by the NIC |
| CVE-2026-72064 | 9.8 CRITICAL | net: mana: Sync page pool RX frags for CPU |
| CVE-2026-74434 | 9.8 CRITICAL | rxrpc: Don't move a peeked OOB message onto the pending queue |
| CVE-2026-72299 | 9.8 CRITICAL | tipc: restrict socket queue dumps in enqueue tracepoints |
| CVE-2026-72429 | 9.8 CRITICAL | ipv6: ioam: fix type confusion of dst_entry |
| CVE-2026-72451 | 9.8 CRITICAL | xfrm: Fix xfrm state cache insertion race |
| CVE-2026-72041 | 9.8 CRITICAL | espintcp: use sk_msg_free_partial to fix partial send |
| CVE-2026-74495 | 9.8 CRITICAL | igbvf: Fix leak in TX DMA error cleanup |
Showing top 20 of 846 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2026-74533
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