| 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-2024-39490: ipv6: sr: fix missing sk_buff release in seg6_input_core |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv6: sr: fix missing sk_buff release in seg6_input_core |
| |
| The seg6_input() function is responsible for adding the SRH into a |
| packet, delegating the operation to the seg6_input_core(). This function |
| uses the skb_cow_head() to ensure that there is sufficient headroom in |
| the sk_buff for accommodating the link-layer header. |
| In the event that the skb_cow_header() function fails, the |
| seg6_input_core() catches the error but it does not release the sk_buff, |
| which will result in a memory leak. |
| |
| This issue was introduced in commit af3b5158b89d ("ipv6: sr: fix BUG due |
| to headroom too small after SRH push") and persists even after commit |
| 7a3f5b0de364 ("netfilter: add netfilter hooks to SRv6 data plane"), |
| where the entire seg6_input() code was refactored to deal with netfilter |
| hooks. |
| |
| The proposed patch addresses the identified memory leak by requiring the |
| seg6_input_core() function to release the sk_buff in the event that |
| skb_cow_head() fails. |
| |
| The Linux kernel CVE team has assigned CVE-2024-39490 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.12 with commit af3b5158b89d3bab9be881113417558c71b71ca4 and fixed in 5.15.161 with commit e8688218e38111ace457509d8f0cad75f79c1a7a |
| Issue introduced in 4.12 with commit af3b5158b89d3bab9be881113417558c71b71ca4 and fixed in 6.1.93 with commit 8f1fc3b86eaea70be6abcae2e9aa7e7b99453864 |
| Issue introduced in 4.12 with commit af3b5158b89d3bab9be881113417558c71b71ca4 and fixed in 6.6.33 with commit f4df8c7670a73752201cbde215254598efdf6ce8 |
| Issue introduced in 4.12 with commit af3b5158b89d3bab9be881113417558c71b71ca4 and fixed in 6.9.4 with commit f5fec1588642e415a3d72e02140160661b303940 |
| Issue introduced in 4.12 with commit af3b5158b89d3bab9be881113417558c71b71ca4 and fixed in 6.10 with commit 5447f9708d9e4c17a647b16a9cb29e9e02820bd9 |
| |
| 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-2024-39490 |
| 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: |
| net/ipv6/seg6_iptunnel.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/e8688218e38111ace457509d8f0cad75f79c1a7a |
| https://git.kernel.org/stable/c/8f1fc3b86eaea70be6abcae2e9aa7e7b99453864 |
| https://git.kernel.org/stable/c/f4df8c7670a73752201cbde215254598efdf6ce8 |
| https://git.kernel.org/stable/c/f5fec1588642e415a3d72e02140160661b303940 |
| https://git.kernel.org/stable/c/5447f9708d9e4c17a647b16a9cb29e9e02820bd9 |
