{"id":"CVE-2026-98856","state":"PUBLISHED","title":"kprobes: Skip disarmed probes when checking optkprobe overlap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n              A    A+1  A+2  A+3  A+4\n  A's jump  | e9 | d0 | d1 | d2 | d3 |\n  after C   | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump.","publishedAt":"2026-10-18T15:51:12.359Z","updatedAt":"2026-10-30T12:40:17.396Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"e29e819cacfb4e3cd56d41eb704ab4718d6d2915","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"ab9ed9faa67bf67383ff7e1479655e232a843c2b","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"3b0f604df9e2b9a456f1ae5266a439998c4c8826","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"3f968dcdf018861129f97910fa7bd680d939a9b0","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"985a568171e7bdba6dcde3420d0e5bb515813457","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"6745fa65f4115045431c0c15610e876855a04625","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"526fac219e8b7d3369b43026bd0a1df51b811cd4","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"7a39c732a22ec4a369af9e19fbe3d666ec83eec4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/kprobes.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.34","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/kprobes.c"]}],"references":["https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915","https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b","https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826","https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0","https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457","https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625","https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4","https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98856.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98856","state":"PUBLISHED","datePublished":"2026-10-18T15:51:12.359Z","dateUpdated":"2026-10-30T12:40:17.396Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.376Z"},"containers":{"cna":{"title":"kprobes: Skip disarmed probes when checking optkprobe overlap","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n              A    A+1  A+2  A+3  A+4\n  A's jump  | e9 | d0 | d1 | d2 | d3 |\n  after C   | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"e29e819cacfb4e3cd56d41eb704ab4718d6d2915","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"ab9ed9faa67bf67383ff7e1479655e232a843c2b","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"3b0f604df9e2b9a456f1ae5266a439998c4c8826","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"3f968dcdf018861129f97910fa7bd680d939a9b0","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"985a568171e7bdba6dcde3420d0e5bb515813457","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"6745fa65f4115045431c0c15610e876855a04625","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"526fac219e8b7d3369b43026bd0a1df51b811cd4","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","status":"affected","lessThan":"7a39c732a22ec4a369af9e19fbe3d666ec83eec4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/kprobes.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.34","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/kprobes.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915"},{"url":"https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b"},{"url":"https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826"},{"url":"https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0"},{"url":"https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"},{"url":"https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"},{"url":"https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4"},{"url":"https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:40:17.396Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}