{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2022-49626", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix use after free when disabling sriov\n\nUse after free is detected by kfence when disabling sriov. What was read\nafter being freed was vf->pci_dev: it was freed from pci_disable_sriov\nand later read in efx_ef10_sriov_free_vf_vports, called from\nefx_ef10_sriov_free_vf_vswitching.\n\nSet the pointer to NULL at release time to not trying to read it later.\n\nReproducer and dmesg log (note that kfence doesn't detect it every time):\n$ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n$ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n\n BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n\n Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224):\n efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n efx_ef10_pci_sriov_disable+0x38/0x70 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xfe/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k\n\n allocated by task 6771 on cpu 10 at 3137.860196s:\n pci_alloc_dev+0x21/0x60\n pci_iov_add_virtfn+0x2a2/0x320\n sriov_enable+0x212/0x3e0\n efx_ef10_sriov_configure+0x67/0x80 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xba/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n freed by task 6771 on cpu 12 at 3170.991309s:\n device_release+0x34/0x90\n kobject_cleanup+0x3a/0x130\n pci_iov_remove_virtfn+0xd9/0x120\n sriov_disable+0x30/0xe0\n efx_ef10_pci_sriov_disable+0x57/0x70 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xfe/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "3c5eb87605e85146a78de589b5070a37862425db", "version_value": "3199e34912d84cdfb8a93a984c5ae5c73fb13e84" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.324", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.289", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.253", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.207", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.132", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.56", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.13", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/3199e34912d84cdfb8a93a984c5ae5c73fb13e84", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/3199e34912d84cdfb8a93a984c5ae5c73fb13e84" }, { "url": "https://git.kernel.org/stable/c/c9e75bb22a26e391f189f5a5133dd63dcb57fdaa", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/c9e75bb22a26e391f189f5a5133dd63dcb57fdaa" }, { "url": "https://git.kernel.org/stable/c/9c854ae512b89229aeee93849e9bd4c115b37909", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/9c854ae512b89229aeee93849e9bd4c115b37909" }, { "url": "https://git.kernel.org/stable/c/bcad880865bfb421885364b1f0c7351280fe2b97", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/bcad880865bfb421885364b1f0c7351280fe2b97" }, { "url": "https://git.kernel.org/stable/c/c2240500817b3b4b996cdf2a461a3a5679f49b94", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/c2240500817b3b4b996cdf2a461a3a5679f49b94" }, { "url": "https://git.kernel.org/stable/c/58d93e9d160c0de6d867c7eb4c2206671a351eb1", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/58d93e9d160c0de6d867c7eb4c2206671a351eb1" }, { "url": "https://git.kernel.org/stable/c/e435c4aeeaa073091f7f3b7735af2ef5c97d63f2", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/e435c4aeeaa073091f7f3b7735af2ef5c97d63f2" }, { "url": "https://git.kernel.org/stable/c/ebe41da5d47ac0fff877e57bd14c54dccf168827", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/ebe41da5d47ac0fff877e57bd14c54dccf168827" } ] }, "generator": { "engine": "bippy-5f407fcff5a0" } }