| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37838: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition |
| |
| In the ssi_protocol_probe() function, &ssi->work is bound with |
| ssip_xmit_work(), In ssip_pn_setup(), the ssip_pn_xmit() function |
| within the ssip_pn_ops structure is capable of starting the |
| work. |
| |
| If we remove the module which will call ssi_protocol_remove() |
| to make a cleanup, it will free ssi through kfree(ssi), |
| while the work mentioned above will be used. The sequence |
| of operations that may lead to a UAF bug is as follows: |
| |
| CPU0 CPU1 |
| |
| | ssip_xmit_work |
| ssi_protocol_remove | |
| kfree(ssi); | |
| | struct hsi_client *cl = ssi->cl; |
| | // use ssi |
| |
| Fix it by ensuring that the work is canceled before proceeding |
| with the cleanup in ssi_protocol_remove(). |
| |
| The Linux kernel CVE team has assigned CVE-2025-37838 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.293 with commit d03abc1c2b21324550fa71e12d53e7d3498e0af6 |
| Fixed in 5.10.237 with commit 4a8c29beb8a02b5a0a9d77d608aa14b6f88a6b86 |
| Fixed in 5.15.181 with commit 72972552d0d0bfeb2dec5daf343a19018db36ffa |
| Fixed in 6.1.135 with commit d58493832e284f066e559b8da5ab20c15a2801d3 |
| Fixed in 6.6.88 with commit 58eb29dba712ab0f13af59ca2fe545f5ce360e78 |
| Fixed in 6.12.24 with commit ae5a6a0b425e8f76a9f0677e50796e494e89b088 |
| Fixed in 6.13.12 with commit 834e602d0cc7c743bfce734fad4a46cefc0f9ab1 |
| Fixed in 6.14.3 with commit 4b4194c9a7a8f92db39e8e86c85f4fb12ebbec4f |
| Fixed in 6.15 with commit e3f88665a78045fe35c7669d2926b8d97b892c11 |
| |
| 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-2025-37838 |
| 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/hsi/clients/ssi_protocol.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/d03abc1c2b21324550fa71e12d53e7d3498e0af6 |
| https://git.kernel.org/stable/c/4a8c29beb8a02b5a0a9d77d608aa14b6f88a6b86 |
| https://git.kernel.org/stable/c/72972552d0d0bfeb2dec5daf343a19018db36ffa |
| https://git.kernel.org/stable/c/d58493832e284f066e559b8da5ab20c15a2801d3 |
| https://git.kernel.org/stable/c/58eb29dba712ab0f13af59ca2fe545f5ce360e78 |
| https://git.kernel.org/stable/c/ae5a6a0b425e8f76a9f0677e50796e494e89b088 |
| https://git.kernel.org/stable/c/834e602d0cc7c743bfce734fad4a46cefc0f9ab1 |
| https://git.kernel.org/stable/c/4b4194c9a7a8f92db39e8e86c85f4fb12ebbec4f |
| https://git.kernel.org/stable/c/e3f88665a78045fe35c7669d2926b8d97b892c11 |
