| 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-2025-22108: bnxt_en: Mask the bd_cnt field in the TX BD properly |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bnxt_en: Mask the bd_cnt field in the TX BD properly |
| |
| The bd_cnt field in the TX BD specifies the total number of BDs for |
| the TX packet. The bd_cnt field has 5 bits and the maximum number |
| supported is 32 with the value 0. |
| |
| CONFIG_MAX_SKB_FRAGS can be modified and the total number of SKB |
| fragments can approach or exceed the maximum supported by the chip. |
| Add a macro to properly mask the bd_cnt field so that the value 32 |
| will be properly masked and set to 0 in the bd_cnd field. |
| |
| Without this patch, the out-of-range bd_cnt value will corrupt the |
| TX BD and may cause TX timeout. |
| |
| The next patch will check for values exceeding 32. |
| |
| The Linux kernel CVE team has assigned CVE-2025-22108 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit 3948b05950fdd64002a5f182c65ba5cf2d53cf71 and fixed in 6.14.2 with commit f60b41b815826f15c4d0323f923f398c423178d0 |
| Issue introduced in 6.4 with commit 3948b05950fdd64002a5f182c65ba5cf2d53cf71 and fixed in 6.15 with commit 107b25db61122d8f990987895c2912927b8b6e3f |
| |
| 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-2025-22108 |
| 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/broadcom/bnxt/bnxt.c |
| drivers/net/ethernet/broadcom/bnxt/bnxt.h |
| drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.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/f60b41b815826f15c4d0323f923f398c423178d0 |
| https://git.kernel.org/stable/c/107b25db61122d8f990987895c2912927b8b6e3f |
