{"id":"CVE-2026-45891","summary":"net: hns3: fix double free issue for tx spare buffer","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hns3: fix double free issue for tx spare buffer\n\nIn hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure\nis created for rollback. However, the tx_spare pointer in the original\nring handle is incorrectly left pointing to the old backup memory.\n\nLater, if memory allocation fails in hns3_init_all_ring() during the setup,\nthe error path attempts to free all newly allocated rings. Since tx_spare\ncontains a stale (non-NULL) pointer from the backup, it is mistaken for\na newly allocated buffer and is erroneously freed, leading to a double-free\nof the backup memory.\n\nThe root cause is that the tx_spare field was not cleared after its value\nwas saved in tmp_rings, leaving a dangling pointer.\n\nFix this by setting tx_spare to NULL in the original ring structure\nwhen the creation of the new `tx_spare` fails. This ensures the\nerror cleanup path only frees genuinely newly allocated buffers.","modified":"2026-05-29T04:03:02.472500613Z","published":"2026-05-27T12:17:02.306Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45891.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45891.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45891"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"907676b130711fd1f627824559e92259db2061d1"},{"fixed":"fb6a4c376d454b425555b1b0bda36e99f56ec307"},{"fixed":"43015461662d41dcfb3bb95fadd8a2a42ad8eacf"},{"fixed":"6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"},{"fixed":"d2c785733dfb853ea0b53984c75662a1af230a94"},{"fixed":"fdbccddb7e7822016601829f95de4008e193f7bc"},{"fixed":"c3659273860bed0c8e573b865e3769abc51225a8"},{"fixed":"6d2f142b1e4b203387a92519d9d2e34752a79dbb"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45891.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"fixed":"5.15.202"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.165"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.128"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45891.json"}}],"schema_version":"1.7.5"}