{"id":"CVE-2023-52506","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Set all reserved memblocks on Node#0 at initialization\n\nAfter commit 61167ad5fecdea (\"mm: pass nid to reserve_bootmem_region()\")\nwe get a panic if DEFERRED_S…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Set all reserved memblocks on Node#0 at initialization\n\nAfter commit 61167ad5fecdea (\"mm: pass nid to reserve_bootmem_region()\")\nwe get a panic if DEFERRED_S…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 6.1.56","linux_kernel >= 6.2, < 6.5.6","linux_kernel = 6.6"],"patched":["linux_kernel 6.5.6"],"published":"2024-03-02","updated":"2026-08-15","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-52506","references":[{"url":"https://git.kernel.org/stable/c/19878758accf6b2788091a771d9f9fee7bab11ab","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b795fb9f5861ee256070d59e33130980a01fadd7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/19878758accf6b2788091a771d9f9fee7bab11ab","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/b795fb9f5861ee256070d59e33130980a01fadd7","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/f105e893a8edd48bdf4bef9fef845a9ff402f737","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00222,"epssPercentile":0.13035,"ingestedAt":"2026-08-15T13:26:43.611Z","slug":"CVE-2023-52506","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Set all reserved memblocks on Node#0 at initialization\n\nAfter commit 61167ad5fecdea (\"mm: pass nid to reserve_bootmem_region()\")\nwe get a panic if DEFERRED_STRUCT_PAGE_INIT is enabled:\n\n[    0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000002b82, era == 90000000040e3f28, ra == 90000000040e3f18\n[    0.000000] Oops[#1]:\n[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0+ #733\n[    0.000000] pc 90000000040e3f28 ra 90000000040e3f18 tp 90000000046f4000 sp 90000000046f7c90\n[    0.000000] a0 0000000000000001 a1 0000000000200000 a2 0000000000000040 a3 90000000046f7ca0\n[    0.000000] a4 90000000046f7ca4 a5 0000000000000000 a6 90000000046f7c38 a7 0000000000000000\n[    0.000000] t0 0000000000000002 t1 9000000004b00ac8 t2 90000000040e3f18 t3 90000000040f0800\n[    0.000000] t4 00000000000f0000 t5 80000000ffffe07e t6 0000000000000003 t7 900000047fff5e20\n[    0.000000] t8 aaaaaaaaaaaaaaab u0 0000000000000018 s9 0000000000000000 s0 fffffefffe000000\n[    0.000000] s1 0000000000000000 s2 0000000000000080 s3 0000000000000040 s4 0000000000000000\n[    0.000000] s5 0000000000000000 s6 fffffefffe000000 s7 900000000470b740 s8 9000000004ad4000\n[    0.000000]    ra: 90000000040e3f18 reserve_bootmem_region+0xec/0x21c\n[    0.000000]   ERA: 90000000040e3f28 reserve_bootmem_region+0xfc/0x21c\n[    0.000000]  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)\n[    0.000000]  PRMD: 00000000 (PPLV0 -PIE -PWE)\n[    0.000000]  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)\n[    0.000000]  ECFG: 00070800 (LIE=11 VS=7)\n[    0.000000] ESTAT: 00010800 [PIL] (IS=11 ECode=1 EsubCode=0)\n[    0.000000]  BADV: 0000000000002b82\n[    0.000000]  PRID: 0014d000 (Loongson-64bit, Loongson-3A6000)\n[    0.000000] Modules linked in:\n[    0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____))\n[    0.000000] Stack : 0000000000000000 9000000002eb5430 0000003a00000020 90000000045ccd00\n[    0.000000]         900000000470e000 90000000002c1918 0000000000000000 9000000004110780\n[    0.000000]         00000000fe6c0000 0000000480000000 9000000004b4e368 9000000004110748\n[    0.000000]         0000000000000000 900000000421ca84 9000000004620000 9000000004564970\n[    0.000000]         90000000046f7d78 9000000002cc9f70 90000000002c1918 900000000470e000\n[    0.000000]         9000000004564970 90000000040bc0e0 90000000046f7d78 0000000000000000\n[    0.000000]         0000000000004000 90000000045ccd00 0000000000000000 90000000002c1918\n[    0.000000]         90000000002c1900 900000000470b700 9000000004b4df78 9000000004620000\n[    0.000000]         90000000046200a8 90000000046200a8 0000000000000000 9000000004218b2c\n[    0.000000]         9000000004270008 0000000000000001 0000000000000000 90000000045ccd00\n[    0.000000]         ...\n[    0.000000] Call Trace:\n[    0.000000] [<90000000040e3f28>] reserve_bootmem_region+0xfc/0x21c\n[    0.000000] [<900000000421ca84>] memblock_free_all+0x114/0x350\n[    0.000000] [<9000000004218b2c>] mm_core_init+0x138/0x3cc\n[    0.000000] [<9000000004200e38>] start_kernel+0x488/0x7a4\n[    0.000000] [<90000000040df0d8>] kernel_entry+0xd8/0xdc\n[    0.000000]\n[    0.000000] Code: 02eb21ad  00410f4c  380c31ac <262b818d> 6800b70d  02c1c196  0015001c  57fe4bb1  260002cd\n\nThe reason is early memblock_reserve() in memblock_init() set node id to\nMAX_NUMNODES, making NODE_DATA(nid) a NULL dereference in the call chain\nreserve_bootmem_region() -> init_reserved_page(). After memblock_init(),\nthose late calls of memblock_reserve() operate on subregions of memblock\n.memory regions. As a result, these reserved regions will be set to the\ncorrect node at the first iteration of memmap_init_reserved_pages().\n\nSo set all reserved memblocks on Node#0 at initialization can avoid this\npanic.\n\n## Affected\n\n- `linux_kernel < 6.1.56`\n- `linux_kernel >= 6.2, < 6.5.6`\n- `linux_kernel = 6.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.6`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}