CVE-2026-45891
net: hns3: fix double free issue for tx spare buffer
In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix double free issue for tx spare buffer In hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure is created for rollback. However, the tx_spare pointer in the original ring handle is incorrectly left pointing to the old backup memory. Later, if memory allocation fails in hns3_init_all_ring() during the setup, the error path attempts to free all newly allocated rings. Since tx_spare contains a stale (non-NULL) pointer from the backup, it is mistaken for a newly allocated buffer and is erroneously freed, leading to a double-free of the backup memory. The root cause is that the tx_spare field was not cleared after its value was saved in tmp_rings, leaving a dangling pointer. Fix this by setting tx_spare to NULL in the original ring structure when the creation of the new `tx_spare` fails. This ensures the error cleanup path only frees genuinely newly allocated buffers.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 907676b130711fd1f627824559e92259db2061d1; < fb6a4c376d454b425555b1b0bda36e99f56ec307 (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < 43015461662d41dcfb3bb95fadd8a2a42ad8eacf (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < 6dc10494cfe27b6f1e9adb7e293293ae39c50b7c (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < d2c785733dfb853ea0b53984c75662a1af230a94 (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < fdbccddb7e7822016601829f95de4008e193f7bc (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < c3659273860bed0c8e573b865e3769abc51225a8 (affected, git) ≥ 907676b130711fd1f627824559e92259db2061d1; < 6d2f142b1e4b203387a92519d9d2e34752a79dbb (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
5.14 (affected) ≥ 0; < 5.14 (unaffected, semver) ≥ 5.15.202; ≤ 5.15.* (unaffected, semver) ≥ 6.1.165; ≤ 6.1.* (unaffected, semver) ≥ 6.6.128; ≤ 6.6.* (unaffected, semver) ≥ 6.12.75; ≤ 6.12.* (unaffected, semver) ≥ 6.18.14; ≤ 6.18.* (unaffected, semver) ≥ 6.19.4; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307CNA: Linux
- https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacfCNA: Linux
- https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7cCNA: Linux
- https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94CNA: Linux
- https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bcCNA: Linux
- https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8CNA: Linux
- https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbbCNA: Linux
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