CVE-2026-23454: Linux kernel · net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fa103fc8f56954a60699a29215cb713448a39e87 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in fa103fc8f56954a60699a29215cb713448a39e87, e23bf444512cb85d76012080a76cd1f9e967448e, b88edf12fc3779521ae5f6f1584153b15f7da6df +4
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.
References
- git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6df (opens in a new tab)
- git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e (opens in a new tab)
- git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115 (opens in a new tab)
- git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9 (opens in a new tab)
- git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c (opens in a new tab)
- git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256 (opens in a new tab)
- git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)