CVE-2026-90415
RDMA/cxgb4: free STAG index when TPT entry write fails
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: free STAG index when TPT entry write fails write_tpt_entry() allocates a new STAG index with c4iw_get_resource() and bumps stats.stag.cur before programming the entry. When write_adapter_mem() fails, it returns the error without releasing the index or reversing the statistic. No MR is inserted into rhp->mrs, so deregistration never reclaims it, leaking the index until device teardown. Record whether this call allocated the index and, on a failed write, return it to tpt_table and decrement stats.stag.cur. Key the rollback on both the write error and that flag, not the error alone: a non-reset update carries a caller-owned STAG that this call did not allocate and must not free.
INFO
Published Date :
Sept. 17, 2026, 5:17 p.m.
Last Modified :
Sept. 17, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Apply the specific patch for RDMA/cxgb4 vulnerability.
- Ensure STAG indices are released on write errors.
References to Advisories, Solutions, and Tools
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CVE-2026-90415.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-90415 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-90415
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following table lists the changes that have been made to the
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 17, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: free STAG index when TPT entry write fails write_tpt_entry() allocates a new STAG index with c4iw_get_resource() and bumps stats.stag.cur before programming the entry. When write_adapter_mem() fails, it returns the error without releasing the index or reversing the statistic. No MR is inserted into rhp->mrs, so deregistration never reclaims it, leaking the index until device teardown. Record whether this call allocated the index and, on a failed write, return it to tpt_table and decrement stats.stag.cur. Key the rollback on both the write error and that flag, not the error alone: a non-reset update carries a caller-owned STAG that this call did not allocate and must not free. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90415.json">CVE-2026-90415</a> Added Reference https://git.kernel.org/stable/c/2f17ca7ab5269ac2504e1039c3921373dccd7712 Added Reference https://git.kernel.org/stable/c/5a21e5114cec4cd3f8a2843d4c46bc49634d6e96 Added Reference https://git.kernel.org/stable/c/5fe4731bfbd8d83c4a14b4af3a27329969ce8a99 Added Reference https://git.kernel.org/stable/c/8f6976d635d190e3d7af7103daaa581cf1ccc12e Added Reference https://git.kernel.org/stable/c/9eeafcda1d6c11f0eec532243c4e96ec8c632bd7 Added Reference https://git.kernel.org/stable/c/a2e37d1ab773be3cd26b1c19593ca2dbcece9c57 Added Reference https://git.kernel.org/stable/c/a64e2beb450179a5d43034af8d5476a11eac1486 Added Reference https://git.kernel.org/stable/c/fdfb5cea4bf070cdb31d997efd87bb684df041fd