{"id":"CVE-2026-45891","state":"PUBLISHED","title":"net: hns3: fix double free issue for tx spare buffer","description":"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.","publishedAt":"2026-05-27T12:17:02.306Z","updatedAt":"2026-05-27T12:17:02.306Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"fb6a4c376d454b425555b1b0bda36e99f56ec307","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"43015461662d41dcfb3bb95fadd8a2a42ad8eacf","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"6dc10494cfe27b6f1e9adb7e293293ae39c50b7c","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"d2c785733dfb853ea0b53984c75662a1af230a94","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"fdbccddb7e7822016601829f95de4008e193f7bc","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"c3659273860bed0c8e573b865e3769abc51225a8","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"6d2f142b1e4b203387a92519d9d2e34752a79dbb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"]}],"references":["https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307","https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf","https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c","https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94","https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc","https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8","https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45891.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45891","state":"PUBLISHED","datePublished":"2026-05-27T12:17:02.306Z","dateUpdated":"2026-05-27T12:17:02.306Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.083Z"},"containers":{"cna":{"title":"net: hns3: fix double free issue for tx spare buffer","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"fb6a4c376d454b425555b1b0bda36e99f56ec307","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"43015461662d41dcfb3bb95fadd8a2a42ad8eacf","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"6dc10494cfe27b6f1e9adb7e293293ae39c50b7c","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"d2c785733dfb853ea0b53984c75662a1af230a94","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"fdbccddb7e7822016601829f95de4008e193f7bc","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"c3659273860bed0c8e573b865e3769abc51225a8","versionType":"git"},{"version":"907676b130711fd1f627824559e92259db2061d1","status":"affected","lessThan":"6d2f142b1e4b203387a92519d9d2e34752a79dbb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307"},{"url":"https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf"},{"url":"https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"},{"url":"https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94"},{"url":"https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc"},{"url":"https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8"},{"url":"https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-27T12:17:02.306Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}