{ "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-2023-53326", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53326", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-09-16T16:12:01.464Z", "updatedAt": "2026-05-11T19:42:46.968Z", "importedAt": "2026-10-24T01:57:03.413Z", "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": "powerpc: Don't try to copy PPR for task with NULL pt_regs", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Don't try to copy PPR for task with NULL pt_regs\n\npowerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which\nfrom my (arguably very short) checking is not commonly done for other\narchs. This is fine, except when PF_IO_WORKER's have been created and\nthe task does something that causes a coredump to be generated. Then we\nget this crash:\n\n Kernel attempted to read user page (160) - exploit attempt? (uid: 1000)\n BUG: Kernel NULL pointer dereference on read at 0x00000160\n Faulting instruction address: 0xc0000000000c3a60\n Oops: Kernel access of bad area, sig: 11 [#1]\n LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=32 NUMA pSeries\n Modules linked in: bochs drm_vram_helper drm_kms_helper xts binfmt_misc ecb ctr syscopyarea sysfillrect cbc sysimgblt drm_ttm_helper aes_generic ttm sg libaes evdev joydev virtio_balloon vmx_crypto gf128mul drm dm_mod fuse loop configfs drm_panel_orientation_quirks ip_tables x_tables autofs4 hid_generic usbhid hid xhci_pci xhci_hcd usbcore usb_common sd_mod\n CPU: 1 PID: 1982 Comm: ppc-crash Not tainted 6.3.0-rc2+ #88\n Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries\n NIP: c0000000000c3a60 LR: c000000000039944 CTR: c0000000000398e0\n REGS: c0000000041833b0 TRAP: 0300 Not tainted (6.3.0-rc2+)\n MSR: 800000000280b033 CR: 88082828 XER: 200400f8\n ...\n NIP memcpy_power7+0x200/0x7d0\n LR ppr_get+0x64/0xb0\n Call Trace:\n ppr_get+0x40/0xb0 (unreliable)\n __regset_get+0x180/0x1f0\n regset_get_alloc+0x64/0x90\n elf_core_dump+0xb98/0x1b60\n do_coredump+0x1c34/0x24a0\n get_signal+0x71c/0x1410\n do_notify_resume+0x140/0x6f0\n interrupt_exit_user_prepare_main+0x29c/0x320\n interrupt_exit_user_prepare+0x6c/0xa0\n interrupt_return_srr_user+0x8/0x138\n\nBecause ppr_get() is trying to copy from a PF_IO_WORKER with a NULL\npt_regs.\n\nCheck for a valid pt_regs in both ppc_get/ppr_set, and return an error\nif not set. The actual error value doesn't seem to be important here, so\njust pick -EINVAL.\n\n[mpe: Trim oops in change log, add Fixes & Cc stable]", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "fa439810cc1b3c927ec24ede17d02467e1b143a1", "status": "affected", "versionType": "git", "lessThan": "80a4200d51e5a7e046f4a90f5faa5bafd5a60c58" }, { "version": "fa439810cc1b3c927ec24ede17d02467e1b143a1", "status": "affected", "versionType": "git", "lessThan": "7624973bc15b76d000e8e6f9b8080fcb76d36595" }, { "version": "fa439810cc1b3c927ec24ede17d02467e1b143a1", "status": "affected", "versionType": "git", "lessThan": "064a1c7b0f8403260d77627e62424a72ca26cee2" }, { "version": "fa439810cc1b3c927ec24ede17d02467e1b143a1", "status": "affected", "versionType": "git", "lessThan": "01849382373b867ddcbe7536b9dfa89f3bcea60e" }, { "version": "fa439810cc1b3c927ec24ede17d02467e1b143a1", "status": "affected", "versionType": "git", "lessThan": "fd7276189450110ed835eb0a334e62d2f1c4e3be" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.8" }, { "version": "5.10.177", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.106", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.23", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.2.*" }, { "version": "6.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }