CVE-2026-23454— net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
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I. Basic Information for CVE-2026-23454
Vulnerability Information
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Vulnerability Title
net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp(). mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs. The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp(). Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mana_hwc_destroy_channel函数存在释放后重用，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-23454
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Same Patch Batch · Linux · 2026-04-03 · 72 CVEs total
| CVE-2026-23450 | 9.8 CRITICAL | net/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock() |
| CVE-2026-31402 | 9.8 CRITICAL | nfsd: fix heap overflow in NFSv4.0 LOCK replay cache |
| CVE-2026-23427 | 9.8 CRITICAL | ksmbd: fix use-after-free in durable v2 replay of active file handles |
| CVE-2026-23428 | 9.8 CRITICAL | ksmbd: fix use-after-free of share_conf in compound request |
| CVE-2026-23455 | 9.1 CRITICAL | netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() |
| CVE-2026-23461 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user |
| CVE-2026-23462 | 8.8 HIGH | Bluetooth: HIDP: Fix possible UAF |
| CVE-2026-23425 | 8.8 HIGH | KVM: arm64: Fix ID register initialization for non-protected pKVM guests |
| CVE-2026-23457 | 8.6 HIGH | netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() |
| CVE-2026-23456 | 8.2 HIGH | netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case |
| CVE-2026-23459 | 8.2 HIGH | ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS |
| CVE-2026-31393 | 8.1 HIGH | Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access |
| CVE-2026-31392 | 8.1 HIGH | smb: client: fix krb5 mount with username option |
| CVE-2026-31403 | 7.8 HIGH | NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd |
| CVE-2026-31389 | 7.8 HIGH | spi: fix use-after-free on controller registration failure |
| CVE-2026-23437 | 7.8 HIGH | net: shaper: protect late read accesses to the hierarchy |
| CVE-2026-23458 | 7.8 HIGH | netfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct() |
| CVE-2026-23444 | 7.8 HIGH | wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure |
| CVE-2026-23445 | 7.8 HIGH | igc: fix page fault in XDP TX timestamps handling |
| CVE-2026-23449 | 7.8 HIGH | net/sched: teql: Fix double-free in teql_master_xmit |
Showing top 20 of 72 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-23454
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