{"id":"CVE-2026-53095","state":"PUBLISHED","title":"bpf: Fix abuse of kprobe_write_ctx via freplace","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.","publishedAt":"2026-06-24T16:30:33.684Z","updatedAt":"2026-06-24T16:30:33.684Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"b312cf41b9e43f442613053f6cad39898e1baf96","versionType":"git"},{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8","versionType":"git"},{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"611fe4b79af72d00d80f2223354284447daafae9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"]}],"references":["https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96","https://git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8","https://git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53095.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53095","state":"PUBLISHED","datePublished":"2026-06-24T16:30:33.684Z","dateUpdated":"2026-06-24T16:30:33.684Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.384Z"},"containers":{"cna":{"title":"bpf: Fix abuse of kprobe_write_ctx via freplace","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"b312cf41b9e43f442613053f6cad39898e1baf96","versionType":"git"},{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8","versionType":"git"},{"version":"7384893d970ea114952aef54ad7e3d7d2ca82d4f","status":"affected","lessThan":"611fe4b79af72d00d80f2223354284447daafae9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96"},{"url":"https://git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8"},{"url":"https://git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-24T16:30:33.684Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}