CVE-2025-38685

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At this point console and new frame buffer are mapped\nand sets display vars. Despite failure still it continue to proceed\nupdating the screen at later stages where vc_data is related to previous\nframe buffer and frame buffer info and display vars are mapped to new\nframe buffer and eventully leading to out-of-bounds write in\nfast_imageblit(). This bheviour is excepted only when fg_console is\nequal to requested console which is a visible console and updates screen\nwith invalid struct references in fbcon_putcs()."}], "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 vulnerability is reached only through the FBIOPUT_CON2FBMAP ioctl on a local /dev/fbN character device, with no network or remote data path involved. Setup steps (VT_ACTIVATE, KD_FONT_OP_SET) are likewise local ioctls.\nAC:L - The attacker deterministically forces the vc_resize() failure by installing an oversized user font or targeting a framebuffer whose geometry cannot satisfy fbcon_resize()'s mode/size checks, and selects both the source and target framebuffer as well as which console is foreground. There is no race and no condition outside the attacker's control.\nPR:L - No capability or permission check exists anywhere on the FBIOPUT_CON2FBMAP path in do_fb_ioctl()/fbcon_set_con2fb_map_ioctl()/set_con2fb_map(); an ordinary unprivileged local account with /dev/fb access (video group, or the seat-local user via logind uaccess ACLs, standard on kiosks, embedded and Android-style systems) can trigger it.\nUI:N - The attacking process performs every step itself \u2014 font install, VT activation, and the con2fb ioctl \u2014 with no victim action or interaction required.\nS:U - The corruption stays within the kernel's own vmalloc address space and the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-controlled out-of-bounds write into vmalloc space can corrupt adjacent kernel objects (VMAP_STACK kernel stacks, module data, other vmalloc allocations), which is readily leveraged into arbitrary kernel memory disclosure and full privilege escalation.\nI:H - This is an out-of-bounds write in fast_imageblit() whose destination offset (console vs. framebuffer geometry mismatch) and written u32 values (glyph bitmap from an arbitrary user font, plus fg/bg color words) are both attacker-controlled, yielding a powerful kernel memory corruption and control-flow hijack primitive.\nA:H - Writing past the end of the vmalloc'd framebuffer hits guard pages or corrupts unrelated kernel structures, producing a KASAN report, oops, or kernel panic \u2014 exactly as reported by syzbot \u2014 and can be repeated at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/video/fbdev/core/fbcon.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "078e62bffca4b7e72e8f3550eb063ab981c36c7a", "status": "affected", "versionType": "git"}, {"version": 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At this point console and new frame buffer are mapped\nand sets display vars. Despite failure still it continue to proceed\nupdating the screen at later stages where vc_data is related to previous\nframe buffer and frame buffer info and display vars are mapped to new\nframe buffer and eventully leading to out-of-bounds write in\nfast_imageblit(). This bheviour is excepted only when fg_console is\nequal to requested console which is a visible console and updates screen\nwith invalid struct references in fbcon_putcs()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: Correcci\u00f3n de escritura fuera de l\u00edmites de vmalloc en fast_imageblit\n\nEste problema se activa cuando un programa de espacio de usuario realiza un ioctl FBIOPUT_CON2FBMAP pasando el n\u00famero de consola y el n\u00famero de b\u00fafer de fotogramas. Idealmente, esto mapea la consola al b\u00fafer de fotogramas y actualiza la pantalla si la consola est\u00e1 visible.\n\nComo parte del mapeo, tiene que realizar un redimensionamiento de la consola seg\u00fan la informaci\u00f3n del b\u00fafer de fotogramas. Si este redimensionamiento falla y regresa de vc_do_resize() y contin\u00faa m\u00e1s all\u00e1. En este punto, la consola y el nuevo b\u00fafer de fotogramas est\u00e1n mapeados y establece las variables de visualizaci\u00f3n. A pesar del fallo, a\u00fan as\u00ed contin\u00faa procediendo a actualizar la pantalla en etapas posteriores donde vc_data est\u00e1 relacionado con el b\u00fafer de fotogramas anterior y la informaci\u00f3n del b\u00fafer de fotogramas y las variables de visualizaci\u00f3n est\u00e1n mapeadas al nuevo b\u00fafer de fotogramas y eventualmente llevando a una escritura fuera de l\u00edmites en fast_imageblit(). Este comportamiento se espera solo cuando fg_console es igual a la consola solicitada, que es una consola visible, y actualiza la pantalla con referencias de estructura inv\u00e1lidas en fbcon_putcs()."}], "id": "CVE-2025-38685", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-09-04T16:15:36.397", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/078e62bffca4b7e72e8f3550eb063ab981c36c7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27b118aebdd84161c8ff5ce49d9d536f2af10754"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c4d7ddaf1d43780b106bedc692679f965dc5a3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56701bf9eeb63219e378cb7fcbd066ea4eaeeb50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfec17721265e72e50cc69c6004fe3475cd38df2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit", "id": "2393186", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393186"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38685", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38685\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38685\nhttps://lore.kernel.org/linux-cve-announce/2025090447-CVE-2025-38685-d633@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-09-05T14:02:49.163682+00:00", "updated": "2025-09-05T14:02:49.163738+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}