{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98888","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.378Z","datePublished":"2026-10-23T11:37:46.984Z","dateUpdated":"2026-10-26T06:56:13.106Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-26T06:56:13.106Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: kprobes: Allow reentering kprobes while single-stepping\n\nA kprobe can be hit while another kprobe is in KPROBE_HIT_SS state. This\ncan happen when tracing or perf code runs from the debug exception path\nwhile the first kprobe is preparing or executing its out-of-line\nsingle-step instruction.\n\nCurrently arm64 treats a kprobe hit in KPROBE_HIT_SS as unrecoverable,\nthe same as a hit in KPROBE_REENTER. This is too strict. A hit in\nKPROBE_HIT_SS is still a one-level reentry and can be handled by saving\nthe current kprobe state and setting up single-step for the new probe,\njust like reentry from KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE.\n\nThe truly unrecoverable case is hitting another kprobe while already in\nKPROBE_REENTER, because the reentry save area has already been consumed.\n\nMove KPROBE_HIT_SS to the recoverable reentry cases and leave\nKPROBE_REENTER as the unrecoverable nested reentry case.\n\nThis change also requires saving saved_irqflag in struct prev_kprobe.\nWhen a nested kprobe calls kprobes_save_local_irqflag(), it overwrites\nkcb->saved_irqflag with the currently masked DAIF value, losing the\nouter kprobe's original DAIF state. Without this fix, when the outer\nkprobe's single-step finishes, kprobes_restore_local_irqflag() applies\nthe wrong DAIF mask and leaves interrupts permanently disabled.\n\nExtend struct prev_kprobe with a saved_irqflag field and save/restore it\nalongside kp and status. This ensures the outer kprobe's original\ninterrupt state is preserved across reentry.\n\nThis mirrors the x86 fix in commit 6a5022a56ac3\n(\"kprobes/x86: Allow to handle reentered kprobe on single-stepping\")."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/kprobes.h","arch/arm64/kernel/probes/kprobes.c"],"versions":[{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"bb0fe9121aa0824211aafa33c7d0151fd25ddb75","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"f96a0606de6bcc8d937b80e6470fd7a174c17e26","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"1f342b3e44c3035a837b53b217d816f7511c0d0a","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"c8e84e292ed4cfc199824146da71bb4397b02a1f","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"68774caca799e9695db56d426c69acebd041c2ed","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"a21bf9cb893126e8d9730995708d0be5eb167652","status":"affected","versionType":"git"},{"version":"2dd0e8d2d2a157dbc83295a78336c2217110f2f8","lessThan":"23f851ac0078a908bf3422d6467ebc1db5828c46","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/kprobes.h","arch/arm64/kernel/probes/kprobes.c"],"versions":[{"version":"4.8","status":"affected"},{"version":"0","lessThan":"4.8","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/bb0fe9121aa0824211aafa33c7d0151fd25ddb75"},{"url":"https://git.kernel.org/stable/c/f96a0606de6bcc8d937b80e6470fd7a174c17e26"},{"url":"https://git.kernel.org/stable/c/1f342b3e44c3035a837b53b217d816f7511c0d0a"},{"url":"https://git.kernel.org/stable/c/c8e84e292ed4cfc199824146da71bb4397b02a1f"},{"url":"https://git.kernel.org/stable/c/68774caca799e9695db56d426c69acebd041c2ed"},{"url":"https://git.kernel.org/stable/c/a21bf9cb893126e8d9730995708d0be5eb167652"},{"url":"https://git.kernel.org/stable/c/23f851ac0078a908bf3422d6467ebc1db5828c46"}],"title":"arm64: kprobes: Allow reentering kprobes while single-stepping","x_generator":{"engine":"bippy-1.2.0"}}}}