CVE-2026-23454net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
Updated under an hour ago ()
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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.
- CVSS
- 7.0 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before b88edf12fc3779521ae5f6f1584153b15f7da6df; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before e23bf444512cb85d76012080a76cd1f9e967448e; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 249e905571583a434d4ea8d6f92ccc0eef337115; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 2b001901f689021acd7bf2dceed74a1bdcaaa1f9; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before afdb1533eb9c05432aeb793a7280fa827c502f5c; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 05d345719d85b927cba74afac4d5322de3aa4256; from ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before fa103fc8f56954a60699a29215cb713448a39e87 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.13 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0; 7.0; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6dfpatch
- https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448epatch
- https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115patch
- https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9patch
- https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5cpatch
- https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256patch
- https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.