{"id":"DEBIAN-CVE-2022-49851","details":"In the Linux kernel, the following vulnerability has been resolved:  riscv: fix reserved memory setup  Currently, RISC-V sets up reserved memory using the \"early\" copy of the device tree. As a result, when trying to get a reserved memory region using of_reserved_mem_lookup(), the pointer to reserved memory regions is using the early, pre-virtual-memory address which causes a kernel panic when trying to use the buffer's name:   Unable to handle kernel paging request at virtual address 00000000401c31ac  Oops [#1]  Modules linked in:  CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1  Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)  epc : string+0x4a/0xea   ra : vsnprintf+0x1e4/0x336  epc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0   gp : ffffffff812e0a98 tp : ffffffff8120de40 t0 : 0000000000000000   t1 : ffffffff81203e28 t2 : 7265736572203a46 s0 : ffffffff81203c20   s1 : ffffffff81203e28 a0 : ffffffff81203d22 a1 : 0000000000000000   a2 : ffffffff81203d08 a3 : 0000000081203d21 a4 : ffffffffffffffff   a5 : 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff   s2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008   s5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00   s8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 0000000000000002   s11: ffffffff80d9821c t3 : ffffffff812f3617 t4 : ffffffff812f3617   t5 : ffffffff812f3618 t6 : ffffffff81203d08  status: 0000000200000100 badaddr: 00000000401c31ac cause: 000000000000000d  [\u003cffffffff80338936\u003e] vsnprintf+0x1e4/0x336  [\u003cffffffff80055ae2\u003e] vprintk_store+0xf6/0x344  [\u003cffffffff80055d86\u003e] vprintk_emit+0x56/0x192  [\u003cffffffff80055ed8\u003e] vprintk_default+0x16/0x1e  [\u003cffffffff800563d2\u003e] vprintk+0x72/0x80  [\u003cffffffff806813b2\u003e] _printk+0x36/0x50  [\u003cffffffff8068af48\u003e] print_reserved_mem+0x1c/0x24  [\u003cffffffff808057ec\u003e] paging_init+0x528/0x5bc  [\u003cffffffff808031ae\u003e] setup_arch+0xd0/0x592  [\u003cffffffff8080070e\u003e] start_kernel+0x82/0x73c  early_init_fdt_scan_reserved_mem() takes no arguments as it operates on initial_boot_params, which is populated by early_init_dt_verify(). On RISC-V, early_init_dt_verify() is called twice. Once, directly, in setup_arch() if CONFIG_BUILTIN_DTB is not enabled and once indirectly, very early in the boot process, by parse_dtb() when it calls early_init_dt_scan_nodes().  This first call uses dtb_early_va to set initial_boot_params, which is not usable later in the boot process when early_init_fdt_scan_reserved_mem() is called. On arm64 for example, the corresponding call to early_init_dt_scan_nodes() uses fixmap addresses and doesn't suffer the same fate.  Move early_init_fdt_scan_reserved_mem() further along the boot sequence, after the direct call to early_init_dt_verify() in setup_arch() so that the names use the correct virtual memory addresses. The above supposed that CONFIG_BUILTIN_DTB was not set, but should work equally in the case where it is - unflatted_and_copy_device_tree() also updates initial_boot_params.","modified":"2026-09-01T16:05:33.941311545Z","published":"2025-05-01T15:16:08.680Z","upstream":["CVE-2022-49851"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49851"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49851.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49851.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49851.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}