| 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-2025-21676: net: fec: handle page_pool_dev_alloc_pages error |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: fec: handle page_pool_dev_alloc_pages error |
| |
| The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did |
| not handle the case when it returned NULL. There was a WARN_ON(!new_page) |
| but it would still proceed to use the NULL pointer and then crash. |
| |
| This case does seem somewhat rare but when the system is under memory |
| pressure it can happen. One case where I can duplicate this with some |
| frequency is when writing over a smbd share to a SATA HDD attached to an |
| imx6q. |
| |
| Setting /proc/sys/vm/min_free_kbytes to higher values also seems to solve |
| the problem for my test case. But it still seems wrong that the fec driver |
| ignores the memory allocation error and can crash. |
| |
| This commit handles the allocation error by dropping the current packet. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21676 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1 with commit 95698ff6177b5f1f13f251da60e7348413046ae4 and fixed in 6.6.74 with commit 8a0097db0544b658c159ac787319737712063a23 |
| Issue introduced in 6.1 with commit 95698ff6177b5f1f13f251da60e7348413046ae4 and fixed in 6.12.11 with commit 1425cb829556398f594658512d49292f988a2ab0 |
| Issue introduced in 6.1 with commit 95698ff6177b5f1f13f251da60e7348413046ae4 and fixed in 6.13 with commit 001ba0902046cb6c352494df610718c0763e77a5 |
| |
| 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-2025-21676 |
| 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/freescale/fec_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/8a0097db0544b658c159ac787319737712063a23 |
| https://git.kernel.org/stable/c/1425cb829556398f594658512d49292f988a2ab0 |
| https://git.kernel.org/stable/c/001ba0902046cb6c352494df610718c0763e77a5 |
