{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-49851", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49851", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-05-01T14:10:06.274Z", "updatedAt": "2026-05-23T15:22:59.677Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "riscv: fix reserved memory setup", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: fix reserved memory setup\n\nCurrently, RISC-V sets up reserved memory using the \"early\" copy of the\ndevice tree. As a result, when trying to get a reserved memory region\nusing of_reserved_mem_lookup(), the pointer to reserved memory regions\nis using the early, pre-virtual-memory address which causes a kernel\npanic when trying to use the buffer's name:\n\n Unable to handle kernel paging request at virtual address 00000000401c31ac\n Oops [#1]\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1\n Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)\n epc : string+0x4a/0xea\n ra : vsnprintf+0x1e4/0x336\n epc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0\n gp : ffffffff812e0a98 tp : ffffffff8120de40 t0 : 0000000000000000\n t1 : ffffffff81203e28 t2 : 7265736572203a46 s0 : ffffffff81203c20\n s1 : ffffffff81203e28 a0 : ffffffff81203d22 a1 : 0000000000000000\n a2 : ffffffff81203d08 a3 : 0000000081203d21 a4 : ffffffffffffffff\n a5 : 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff\n s2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008\n s5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00\n s8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 0000000000000002\n s11: ffffffff80d9821c t3 : ffffffff812f3617 t4 : ffffffff812f3617\n t5 : ffffffff812f3618 t6 : ffffffff81203d08\n status: 0000000200000100 badaddr: 00000000401c31ac cause: 000000000000000d\n [] vsnprintf+0x1e4/0x336\n [] vprintk_store+0xf6/0x344\n [] vprintk_emit+0x56/0x192\n [] vprintk_default+0x16/0x1e\n [] vprintk+0x72/0x80\n [] _printk+0x36/0x50\n [] print_reserved_mem+0x1c/0x24\n [] paging_init+0x528/0x5bc\n [] setup_arch+0xd0/0x592\n [] start_kernel+0x82/0x73c\n\nearly_init_fdt_scan_reserved_mem() takes no arguments as it operates on\ninitial_boot_params, which is populated by early_init_dt_verify(). On\nRISC-V, early_init_dt_verify() is called twice. Once, directly, in\nsetup_arch() if CONFIG_BUILTIN_DTB is not enabled and once indirectly,\nvery early in the boot process, by parse_dtb() when it calls\nearly_init_dt_scan_nodes().\n\nThis first call uses dtb_early_va to set initial_boot_params, which is\nnot usable later in the boot process when\nearly_init_fdt_scan_reserved_mem() is called. On arm64 for example, the\ncorresponding call to early_init_dt_scan_nodes() uses fixmap addresses\nand doesn't suffer the same fate.\n\nMove early_init_fdt_scan_reserved_mem() further along the boot sequence,\nafter the direct call to early_init_dt_verify() in setup_arch() so that\nthe names use the correct virtual memory addresses. The above supposed\nthat CONFIG_BUILTIN_DTB was not set, but should work equally in the case\nwhere it is - unflatted_and_copy_device_tree() also updates\ninitial_boot_params.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "status": "affected", "versionType": "git", "lessThan": "94ab8f88feb75e3b1486102c0c9c550f37d9d137" }, { "version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "status": "affected", "versionType": "git", "lessThan": "518e49f0590de66555503aabe199ba8d3f2e24ac" }, { "version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "status": "affected", "versionType": "git", "lessThan": "93598deb101540c4f9e7de15099ea8255b965fc2" }, { "version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "status": "affected", "versionType": "git", "lessThan": "50e63dd8ed92045eb70a72d7ec725488320fb68b" }, { "version": "f18ed5bee7bb8a0e99e1c7e7d45e0e51d3497248", "status": "affected", "versionType": "git" }, { "version": "5.3.8", "status": "affected", "versionType": "semver", "lessThan": "5.4" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.4" }, { "version": "5.10.155", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.79", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }