| 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-2025-37929: arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays |
| |
| Commit a5951389e58d ("arm64: errata: Add newer ARM cores to the |
| spectre_bhb_loop_affected() lists") added some additional CPUs to the |
| Spectre-BHB workaround, including some new arrays for designs that |
| require new 'k' values for the workaround to be effective. |
| |
| Unfortunately, the new arrays omitted the sentinel entry and so |
| is_midr_in_range_list() will walk off the end when it doesn't find a |
| match. With UBSAN enabled, this leads to a crash during boot when |
| is_midr_in_range_list() is inlined (which was more common prior to |
| c8c2647e69be ("arm64: Make _midr_in_range_list() an exported |
| function")): |
| |
| | Internal error: aarch64 BRK: 00000000f2000001 [#1] PREEMPT SMP |
| | pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| | pc : spectre_bhb_loop_affected+0x28/0x30 |
| | lr : is_spectre_bhb_affected+0x170/0x190 |
| | [...] |
| | Call trace: |
| | spectre_bhb_loop_affected+0x28/0x30 |
| | update_cpu_capabilities+0xc0/0x184 |
| | init_cpu_features+0x188/0x1a4 |
| | cpuinfo_store_boot_cpu+0x4c/0x60 |
| | smp_prepare_boot_cpu+0x38/0x54 |
| | start_kernel+0x8c/0x478 |
| | __primary_switched+0xc8/0xd4 |
| | Code: 6b09011f 54000061 52801080 d65f03c0 (d4200020) |
| | ---[ end trace 0000000000000000 ]--- |
| | Kernel panic - not syncing: aarch64 BRK: Fatal exception |
| |
| Add the missing sentinel entries. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37929 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.181 with commit 46e22de65eb45a67a68ddfe9301f79b0c3821ca8 and fixed in 5.15.182 with commit 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3 |
| Issue introduced in 6.1.135 with commit a53b3599d9bf9375f9033f2aa1fa92714fb1d0f0 and fixed in 6.1.138 with commit 446289b8b36b2ee98dabf6388acbddcc33ed41be |
| Issue introduced in 6.6.88 with commit 4117975672c4743cffaf32b6fd018cfacd1b420e and fixed in 6.6.90 with commit 3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c |
| Issue introduced in 6.12.24 with commit 9ca4fe357464bbdad0db67985275f2694df8dab5 and fixed in 6.12.28 with commit 090c8714efe1c3c470301cc2f794c1ee2a57746c |
| Issue introduced in 6.14.3 with commit e060dbb7393ed7bdfba6b5ea7566f9ef87381cfb and fixed in 6.14.6 with commit 333579202f09e260e8116321df4c55f80a19b160 |
| Issue introduced in 6.13.12 with commit ed681e90fb244aa883b918c4d8be2614e816c6df |
| |
| 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-2025-37929 |
| 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: |
| arch/arm64/kernel/proton-pack.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/6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3 |
| https://git.kernel.org/stable/c/446289b8b36b2ee98dabf6388acbddcc33ed41be |
| https://git.kernel.org/stable/c/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c |
| https://git.kernel.org/stable/c/090c8714efe1c3c470301cc2f794c1ee2a57746c |
| https://git.kernel.org/stable/c/333579202f09e260e8116321df4c55f80a19b160 |
| https://git.kernel.org/stable/c/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72 |
