{"id":"CVE-2026-45909","state":"PUBLISHED","title":"clk: mediatek: Drop __initconst from gates","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nclk: mediatek: Drop __initconst from gates\n\nSince commit 8ceff24a754a (\"clk: mediatek: clk-gate: Refactor\nmtk_clk_register_gate to use mtk_gate struct\") the mtk_gate structs\nare no longer just used for initialization/registration, but also at\nruntime. So drop __initconst annotations.","publishedAt":"2026-05-27T12:17:23.099Z","updatedAt":"2026-08-05T12:28:42.127Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"1debd9ba7eb18af8fb63dc93517c6bbcab0e31ee","versionType":"git"},{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"866d8ecc4e789f7d73d6cafd1b122d1b6032b3b1","versionType":"git"},{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"871afb43e41ad4e8246438de495a939cd0f8113c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/clk/mediatek/clk-mt7981-eth.c","drivers/clk/mediatek/clk-mt8516.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/clk/mediatek/clk-mt7981-eth.c","drivers/clk/mediatek/clk-mt8516.c"]}],"references":["https://git.kernel.org/stable/c/1debd9ba7eb18af8fb63dc93517c6bbcab0e31ee","https://git.kernel.org/stable/c/866d8ecc4e789f7d73d6cafd1b122d1b6032b3b1","https://git.kernel.org/stable/c/871afb43e41ad4e8246438de495a939cd0f8113c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45909.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45909","state":"PUBLISHED","datePublished":"2026-05-27T12:17:23.099Z","dateUpdated":"2026-08-05T12:28:42.127Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.084Z"},"containers":{"cna":{"title":"clk: mediatek: Drop __initconst from gates","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nclk: mediatek: Drop __initconst from gates\n\nSince commit 8ceff24a754a (\"clk: mediatek: clk-gate: Refactor\nmtk_clk_register_gate to use mtk_gate struct\") the mtk_gate structs\nare no longer just used for initialization/registration, but also at\nruntime. So drop __initconst annotations."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"1debd9ba7eb18af8fb63dc93517c6bbcab0e31ee","versionType":"git"},{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"866d8ecc4e789f7d73d6cafd1b122d1b6032b3b1","versionType":"git"},{"version":"8ceff24a754ac065123ae0ec9f31ec03aff55f8a","status":"affected","lessThan":"871afb43e41ad4e8246438de495a939cd0f8113c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/clk/mediatek/clk-mt7981-eth.c","drivers/clk/mediatek/clk-mt8516.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/clk/mediatek/clk-mt7981-eth.c","drivers/clk/mediatek/clk-mt8516.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1debd9ba7eb18af8fb63dc93517c6bbcab0e31ee"},{"url":"https://git.kernel.org/stable/c/866d8ecc4e789f7d73d6cafd1b122d1b6032b3b1"},{"url":"https://git.kernel.org/stable/c/871afb43e41ad4e8246438de495a939cd0f8113c"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is a clock-gate operation in the MediaTek clk driver, reached only by local clock-framework calls (driver/runtime-PM toggling); no remote network input flows into it, so the attacker needs local system access.\nAC:L - This is a use-after-free that becomes active deterministically once free_initmem() releases the .init.rodata gate arrays; the first runtime toggle of an affected gate reliably dereferences freed memory with no race or attacker-uncontrollable condition.\nPR:L - On these SoCs the affected peripheral gates are toggled by ordinary runtime-PM/device-idle transitions that an unprivileged local user can induce through normal device I/O, so basic unprivileged access suffices.\nUI:N - Triggering only requires a clock enable/disable on an affected gate; no victim action such as opening a file or mounting a filesystem is needed.\nS:U - The dangling pointer and its impact are entirely within the kernel's clock subsystem; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The UAF reads a freed init-memory object whose contents can be reclaimed/sprayed by the attacker, and the controlled gate->regs pointer is dereferenced for register offsets, enabling kernel-memory disclosure.\nI:H - Attacker-influenced freed-memory contents control gate->shift and gate->regs, turning regmap_write(offset, BIT(shift)) into a corrupted/controlled MMIO write — memory corruption leverageable beyond simple modification.\nA:H - Dereferencing the dangling cg->gate pointer (and a corrupted gate->regs) after init memory is freed reliably causes a kernel oops/crash."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:28:42.127Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}