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vuln-cve/data/2026/99xxx/CVE-2026-99235.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99235",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.402Z",
"datePublished": "2026-11-02T16:06:41.510Z",
"dateUpdated": "2026-11-03T19:13:03.627Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-11-03T19:13:03.627Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Save the event file instead of the compatible histogram\n\ncreate_field_var_hist() creates a histogram on the matched event to\nsupply a field variable, and records it on the target so it can be torn\ndown later:\n\n\thist_data = find_compatible_hist(target_hist_data, file);\n\t...\n\t/* Save the compatible histogram information */\n\tvar_hist->hist_data = hist_data;\n\nhist_data is not the histogram it creates. It is one that was already\nthere, whose keys the new one copies. The saved pointer has a single\nuser, unregister_field_var_hists(), which runs when the target is\nremoved:\n\n\tfile = hist_data->field_var_hists[i]->hist_data->event_file;\n\nfind_compatible_hist() matches on keys alone, so it can pick one with no\nvariables of its own. check_var_refs() then returns false and the user\ncan remove it while the target still points at it:\n\n BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320\n Read of size 8 at addr ffff8880093b90e0 by task init/1\n\n Freed by task 1:\n kfree+0x154/0x420\n event_hist_trigger_free+0x1d5/0x320\n event_hist_trigger_parse+0x35f3/0x69e0\n trigger_process_regex+0x1a6/0x250\n\nSave the event file instead. It is all the dereference ever wanted, and\nit does not go away when the user removes a trigger."
}
],
"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 attacker-controlled hist text is written locally to events/<sys>/<event>/trigger: event_trigger_write() -> trigger_process_regex() -> event_hist_trigger_parse() -> create_actions()/onmatch_create() -> trace_action_create_field_var() -> create_field_var_hist(). No remote protocol carries the keys or onmatch() field names that make find_compatible_hist() save the dangling pointer.\nAC:L - The attacker writes a keys-only hist on event A, an onmatch().trace() hist on event B so create_field_var_hist() stores A's hist_data, then '!hist' on A and on B. find_compatible_hist() matches keys only, so check_var_refs() lets A be removed; event_mutex serializes every write, with no race or victim state.\nPR:L - create_field_var_hist() is reached only after writes to a TRACE_MODE_WRITE (0640) trigger file and to synthetic_events; event_trigger_regex_open() and the synth file enforce LOCKDOWN_TRACEFS and DAC, not capable(). tracefs_parse_param() uid= is applied by tracefs_apply_options() onto those inodes, so a delegated non-root tracing owner can run the onmatch() sequence; userns cannot mount tracefs.\nUI:N - The attacker performs the compatible-hist write, the onmatch().trace() write that calls create_field_var_hist(), and both '!hist' removals themselves. No other user must mount media, open a file, or enable tracing.\nS:U - The slab use-after-free of the compatible hist_trigger_data is in the host kernel's tracing heap (event_hist_trigger_free()/unregister_field_var_hists()). It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - unregister_field_var_hists() reads field_var_hists[i]->hist_data->event_file from the hist_trigger_data that event_hist_trigger_free() already kfree'd (KASAN 8-byte read). After reclaiming that slab, the attacker controls the pointer then walked as a trace_event_file, a use-after-free read primitive.\nI:H - That attacker-controlled event_file is passed to event_hist_trigger_parse(\"!hist\"), which list_del_rcu()s file->triggers and runs cmd_ops->free on objects taken from the sprayed hist_trigger_data, a heap write and control-flow primitive.\nA:H - The commit reproduces a KASAN slab-use-after-free in event_hist_trigger_free() when the target hist is removed after the compatible one. Without KASAN, the stale hist_data->event_file dereference oopses or panics the kernel."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"versions": [
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "a6165126b1a1b26342b55be6eb6ee23af8756aba",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "173914501b97236d7ea7dc2af7f30feddd4e1436",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "ac815a379644b2ad5008a009a3516ada31b5dd82",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "8b307d64a60548e4a74cb746f74d7ed4bd49965e",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "7a111ba0d1b74c99bc8f096565dc71945f694254",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "9631dbccd3c649b567a5aafffea6b00634183997",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "7cafc82e6153f05a221be678cd649d02e06ba909",
"status": "affected",
"versionType": "git"
},
{
"version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
"lessThan": "d5c42664fc094899af9aae5300b27fe8fdb658ef",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"versions": [
{
"version": "4.17",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.17",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.60",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.14",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3.1",
"lessThanOrEqual": "7.3.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.4-rc1",
"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": "4.17",
"versionEndExcluding": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.1.191"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.6.161"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.12.115"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.18.60"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "7.2.14"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "7.3.1"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "7.4-rc1"
}
]
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]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba"
},
{
"url": "https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436"
},
{
"url": "https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82"
},
{
"url": "https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e"
},
{
"url": "https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254"
},
{
"url": "https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea"
},
{
"url": "https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997"
},
{
"url": "https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909"
},
{
"url": "https://git.kernel.org/stable/c/d5c42664fc094899af9aae5300b27fe8fdb658ef"
}
],
"title": "tracing: Save the event file instead of the compatible histogram",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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