| 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-2021-47236: net: cdc_eem: fix tx fixup skb leak |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: cdc_eem: fix tx fixup skb leak |
| |
| when usbnet transmit a skb, eem fixup it in eem_tx_fixup(), |
| if skb_copy_expand() failed, it return NULL, |
| usbnet_start_xmit() will have no chance to free original skb. |
| |
| fix it by free orginal skb in eem_tx_fixup() first, |
| then check skb clone status, if failed, return NULL to usbnet. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47236 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 4.4.274 with commit f12554b0ff639e74612cc01b3b4a049e098d2d65 |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 4.9.274 with commit 14184ec5c958b589ba934da7363a2877879204df |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 4.14.238 with commit 1bcacd6088d61c0ac6a990d87975600a81f3247e |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 4.19.196 with commit f4e6a7f19c82f39b1803e91c54718f0d7143767d |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 5.4.128 with commit 81de2ed06df8b5451e050fe6a318af3263dbff3f |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 5.10.46 with commit 05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 5.12.13 with commit b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 |
| Issue introduced in 2.6.30 with commit 9f722c0978b04acba209f8ca1896ad05814bc3a3 and fixed in 5.13 with commit c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 |
| |
| 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-2021-47236 |
| 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/usb/cdc_eem.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/f12554b0ff639e74612cc01b3b4a049e098d2d65 |
| https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df |
| https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e |
| https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d |
| https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f |
| https://git.kernel.org/stable/c/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 |
| https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 |
| https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 |
