| 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-2024-26816: x86, relocs: Ignore relocations in .notes section |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| x86, relocs: Ignore relocations in .notes section |
| |
| When building with CONFIG_XEN_PV=y, .text symbols are emitted into |
| the .notes section so that Xen can find the "startup_xen" entry point. |
| This information is used prior to booting the kernel, so relocations |
| are not useful. In fact, performing relocations against the .notes |
| section means that the KASLR base is exposed since /sys/kernel/notes |
| is world-readable. |
| |
| To avoid leaking the KASLR base without breaking unprivileged tools that |
| are expecting to read /sys/kernel/notes, skip performing relocations in |
| the .notes section. The values readable in .notes are then identical to |
| those found in System.map. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26816 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 4.19.311 with commit 13edb509abc91c72152a11baaf0e7c060a312e03 |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 5.4.273 with commit 52018aa146e3cf76569a9b1e6e49a2b7c8d4a088 |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 5.10.214 with commit a4e7ff1a74274e59a2de9bb57236542aa990d20a |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 5.15.153 with commit c7cff9780297d55d97ad068b68b703cfe53ef9af |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 6.1.83 with commit 47635b112a64b7b208224962471e7e42f110e723 |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 6.6.23 with commit af2a9f98d884205145fd155304a6955822ccca1c |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 6.7.11 with commit ae7079238f6faf1b94accfccf334e98b46a0c0aa |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 6.8.2 with commit 5cb59db49c9c0fccfd33b2209af4f7ae3c6ddf40 |
| Issue introduced in 2.6.23 with commit 5ead97c84fa7d63a6a7a2f4e9f18f452bd109045 and fixed in 6.9 with commit aaa8736370db1a78f0e8434344a484f9fd20be3b |
| |
| 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-2024-26816 |
| 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/x86/tools/relocs.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/13edb509abc91c72152a11baaf0e7c060a312e03 |
| https://git.kernel.org/stable/c/52018aa146e3cf76569a9b1e6e49a2b7c8d4a088 |
| https://git.kernel.org/stable/c/a4e7ff1a74274e59a2de9bb57236542aa990d20a |
| https://git.kernel.org/stable/c/c7cff9780297d55d97ad068b68b703cfe53ef9af |
| https://git.kernel.org/stable/c/47635b112a64b7b208224962471e7e42f110e723 |
| https://git.kernel.org/stable/c/af2a9f98d884205145fd155304a6955822ccca1c |
| https://git.kernel.org/stable/c/ae7079238f6faf1b94accfccf334e98b46a0c0aa |
| https://git.kernel.org/stable/c/5cb59db49c9c0fccfd33b2209af4f7ae3c6ddf40 |
| https://git.kernel.org/stable/c/aaa8736370db1a78f0e8434344a484f9fd20be3b |
