{"id":"CVE-2026-53095","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-53095","generatedAt":"2026-10-28T02:24:39.829Z","title":"In the Linux kernel, the following vulnerability has been resolved: bpf: Fix abuse of kprobe_write_ctx via freplace uprobe programs are allowed to modify struct pt_regs.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix abuse of kprobe_write_ctx via freplace\n\nuprobe programs are allowed to modify struct pt_regs.\n\nSince the actual program type of uprobe is KPROBE, it can be abused to\nmodify struct pt_regs via kprobe+freplace when the kprobe attaches to\nkernel functions.\n\nFor example,\n\nSEC(\"?kprobe\")\nint kprobe(struct pt_regs *regs)\n{\n\treturn 0;\n}\n\nSEC(\"?freplace\")\nint freplace_kprobe(struct pt_regs *regs)\n{\n\tregs->di = 0;\n\treturn 0;\n}\n\nfreplace_kprobe prog will attach to kprobe prog.\nkprobe prog will attach to a kernel function.\n\nWithout this patch, when the kernel function runs, its first arg will\nalways be set as 0 via the freplace_kprobe prog.\n\nTo fix the abuse of kprobe_write_ctx=true via kprobe+freplace, disallow\nattaching freplace programs on kprobe programs with different\nkprobe_write_ctx values.","published":"2026-06-24T17:17:24.000Z","lastModified":"2026-07-21T18:21:59.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":["linux/linux kernel"],"epss":{"score":0.0016,"percentile":0.05132,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53095","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}