CVE-2026-45891
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-415
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacfPatch
- https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbbPatch
- https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7cPatch
- https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8Patch
- https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94Patch
- https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307Patch
- https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bcPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.