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Date: Wed, 10 Apr 2024 15:54:40 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.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 5ead97c84fa7 and fixed in 4.19.311 with commit 13edb509abc9 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 5.4.273 with commit 52018aa146e3 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 5.10.214 with commit a4e7ff1a7427 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 5.15.153 with commit c7cff9780297 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 6.1.83 with commit 47635b112a64 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 6.6.23 with commit af2a9f98d884 Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 6.7.11 with commit ae7079238f6f Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 6.8.2 with commit 5cb59db49c9c Issue introduced in 2.6.23 with commit 5ead97c84fa7 and fixed in 6.9-rc1 with commit aaa8736370db 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
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