CVE-2026-45891
published 2026-05-27CVE-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…
medium5.5
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.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < fb6a4c376d454b425555b1b0bda36e99f56ec307 | fb6a4c376d454b425555b1b0bda36e99f56ec307 |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < 43015461662d41dcfb3bb95fadd8a2a42ad8eacf | 43015461662d41dcfb3bb95fadd8a2a42ad8eacf |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < 6dc10494cfe27b6f1e9adb7e293293ae39c50b7c | 6dc10494cfe27b6f1e9adb7e293293ae39c50b7c |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < d2c785733dfb853ea0b53984c75662a1af230a94 | d2c785733dfb853ea0b53984c75662a1af230a94 |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < fdbccddb7e7822016601829f95de4008e193f7bc | fdbccddb7e7822016601829f95de4008e193f7bc |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < c3659273860bed0c8e573b865e3769abc51225a8 | c3659273860bed0c8e573b865e3769abc51225a8 |
| linux | linux | >= 907676b130711fd1f627824559e92259db2061d1 < 6d2f142b1e4b203387a92519d9d2e34752a79dbb | 6d2f142b1e4b203387a92519d9d2e34752a79dbb |
| linux | linux_kernel | — | — |