| From bippy-7c5fe7eed585 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-2025-21993: iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() |
| |
| When performing an iSCSI boot using IPv6, iscsistart still reads the |
| /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix |
| length is 64, this causes the shift exponent to become negative, |
| triggering a UBSAN warning. As the concept of a subnet mask does not |
| apply to IPv6, the value is set to ~0 to suppress the warning message. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21993 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.292 with commit a858cd58dea06cf85b142673deea8c5d87f11e70 |
| Fixed in 5.10.236 with commit f763c82db8166e28f45b7cc4a5398a7859665940 |
| Fixed in 5.15.180 with commit b388e185bfad32bfed6a97a6817f74ca00a4318f |
| Fixed in 6.1.132 with commit 9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c |
| Fixed in 6.6.84 with commit 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d |
| Fixed in 6.12.20 with commit b253660fac5e0e9080d2c95e3a029e1898d49afb |
| Fixed in 6.13.8 with commit c1c6e527470e5eab0b2d57bd073530fbace39eab |
| Fixed in 6.14 with commit 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 |
| |
| 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-2025-21993 |
| 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/firmware/iscsi_ibft.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/a858cd58dea06cf85b142673deea8c5d87f11e70 |
| https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940 |
| https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f |
| https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c |
| https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d |
| https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb |
| https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab |
| https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 |
