CVE-2025-39841
Linux Kernel buffer overflow
- Published19 Sept 2025
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix buffer free/clear order in deferred receive path Fix a use-after-free window by correcting the buffer release sequence in the deferred receive path. The code freed the RQ buffer first and only then cleared the context pointer under the lock. Concurrent paths (e.g., ABTS and the repost path) also inspect and release the same pointer under the lock, so the old order could lead to double-free/UAF. Note that the repost path already uses the correct pattern: detach the pointer under the lock, then free it after dropping the lock. The deferred path should do the same.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
- https://git.kernel.org/stable/c/367cb5ffd8a8a4c85dc89f55e7fa7cc191425b11
- https://git.kernel.org/stable/c/55658c7501467ca9ef3bd4453dd920010db8bc13
- https://git.kernel.org/stable/c/897f64b01c1249ac730329b83f4f40bab71e86c7
- https://git.kernel.org/stable/c/95b63d15fce5c54a73bbf195e1aacb5a75b128e2
- https://git.kernel.org/stable/c/9dba9a45c348e8460da97c450cddf70b2056deb3
- https://git.kernel.org/stable/c/ab34084f42ee06a9028d67c78feafb911d33d111
References
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-089022.html
- https://git.kernel.org/stable/c/367cb5ffd8a8a4c85dc89f55e7fa7cc191425b11
- https://git.kernel.org/stable/c/55658c7501467ca9ef3bd4453dd920010db8bc13
- https://git.kernel.org/stable/c/897f64b01c1249ac730329b83f4f40bab71e86c7
- https://git.kernel.org/stable/c/95b63d15fce5c54a73bbf195e1aacb5a75b128e2
- https://git.kernel.org/stable/c/9dba9a45c348e8460da97c450cddf70b2056deb3
- https://git.kernel.org/stable/c/ab34084f42ee06a9028d67c78feafb911d33d111
- https://git.kernel.org/stable/c/baa39f6ad79d372a6ce0aa639fbb2f1578479f57
- https://git.kernel.org/stable/c/d96cc9a1b57725930c60b607423759d563b4d900
and 2 more references
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2025-39841 being actively exploited?
CVE-2025-39841 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.47%.
How severe is CVE-2025-39841?
CVE-2025-39841 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.47% probability of exploitation.
Which products are affected by CVE-2025-39841?
Affected products include Debian Linux, Linux Kernel.
How do I fix CVE-2025-39841?
Upgrade affected software to a fixed version, for example Linux Kernel 5.4.299 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2025-39841 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.