| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-46998: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ethernet:enic: Fix a use after free bug in enic_hard_start_xmit |
| |
| In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside |
| enic_queue_wq_skb, if some error happens, the skb will be freed |
| by dev_kfree_skb(skb). But the freed skb is still used in |
| skb_tx_timestamp(skb). |
| |
| My patch makes enic_queue_wq_skb() return error and goto spin_unlock() |
| incase of error. The solution is provided by Govind. |
| See https://lkml.org/lkml/2021/4/30/961. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46998 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 4.19.191 with commit 25a87b1f566b5eb2af2857a928f0e2310d900976 |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 5.4.120 with commit f7f6f07774091a6ddd98500b85386c3c6afb30d3 |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 5.10.38 with commit 7afdd6aba95c8a526038e7abe283eeac3e4320f1 |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 5.11.22 with commit 6892396ebf04ea2c021d80e10f4075e014cd7cc3 |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 5.12.5 with commit d90529392aaf498dafa95d212295d64b2cea4e24 |
| Issue introduced in 4.16 with commit fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 and fixed in 5.13 with commit 643001b47adc844ae33510c4bb93c236667008a3 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-46998 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/net/ethernet/cisco/enic/enic_main.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 |
| https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 |
| https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 |
| https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 |
| https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 |
| https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 |
