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CVE-2026-23463— soc: fsl: qbman: fix race condition in qman_destroy_fq

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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qman_destroy_fq函数存在竞争条件，可能导致数据损坏。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.09% · P1

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c535e923bb97a4b361e89a6383693482057f8b0c< 66442cf9989bd4489fa80d9f37637d58ab016835 affected
c535e923bb97a4b361e89a6383693482057f8b0c< d288fbe652ef43b7128e4bc0c0c2ef6bd03a2210 affected
c535e923bb97a4b361e89a6383693482057f8b0c< 9e3d47904b8153c8c3ad2f9b66d5008aad677aa8 affected
c535e923bb97a4b361e89a6383693482057f8b0c< d21923a8059fa896bfef016f55dd769299335cb4 affected
c535e923bb97a4b361e89a6383693482057f8b0c< 751f60bd48edaf03f9d84ab09e5ce6705757d50f affected
c535e923bb97a4b361e89a6383693482057f8b0c< 85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa affected
c535e923bb97a4b361e89a6383693482057f8b0c< 265e56714635c5dd1e5964bfd97fa6e73f62cde5 affected
c535e923bb97a4b361e89a6383693482057f8b0c< 014077044e874e270ec480515edbc1cadb976cf2 affected
… +10 more rows
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I. Basic Information for CVE-2026-23463

Vulnerability Information
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Vulnerability Title
soc: fsl: qbman: fix race condition in qman_destroy_fq
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: soc: fsl: qbman: fix race condition in qman_destroy_fq When QMAN_FQ_FLAG_DYNAMIC_FQID is set, there's a race condition between fq_table[fq->idx] state and freeing/allocating from the pool and WARN_ON(fq_table[fq->idx]) in qman_create_fq() gets triggered. Indeed, we can have: Thread A Thread B qman_destroy_fq() qman_create_fq() qman_release_fqid() qman_shutdown_fq() gen_pool_free() -- At this point, the fqid is available again -- qman_alloc_fqid() -- so, we can get the just-freed fqid in thread B -- fq->fqid = fqid; fq->idx = fqid * 2; WARN_ON(fq_table[fq->idx]); fq_table[fq->idx] = fq; fq_table[fq->idx] = NULL; And adding some logs between qman_release_fqid() and fq_table[fq->idx] = NULL makes the WARN_ON() trigger a lot more. To prevent that, ensure that fq_table[fq->idx] is set to NULL before gen_pool_free() is called by using smp_wmb().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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qman_destroy_fq函数存在竞争条件，可能导致数据损坏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux c535e923bb97a4b361e89a6383693482057f8b0c ~ 66442cf9989bd4489fa80d9f37637d58ab016835 -
Linux Linux 4.9 -

II. Public POCs for CVE-2026-23463

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III. Intelligence Information for CVE-2026-23463

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Same Patch Batch · Linux · 2026-04-03 · 71 CVEs total

CVE-2026-31402 9.8 CRITICAL nfsd: fix heap overflow in NFSv4.0 LOCK replay cache
CVE-2026-23450 9.8 CRITICAL net/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock()
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-2026-23425 8.8 HIGH KVM: arm64: Fix ID register initialization for non-protected pKVM guests
CVE-2026-23462 8.8 HIGH Bluetooth: HIDP: Fix possible UAF
CVE-2026-23457 8.6 HIGH netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()
CVE-2026-23459 8.2 HIGH ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS
CVE-2026-23456 8.2 HIGH netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case
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-2026-31398 7.8 HIGH mm/rmap: fix incorrect pte restoration for lazyfree folios
CVE-2026-23432 7.8 HIGH mshv: Fix use-after-free in mshv_map_user_memory error path
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 71 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23463

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