CVE-2026-23064 (GCVE-0-2026-23064)
Vulnerability from cvelistv5 – Published: 2026-02-04 16:07 – Updated: 2026-05-11 21:59
VLAI
EPSS
VEX
Title
net/sched: act_ife: avoid possible NULL deref
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_ife: avoid possible NULL deref
tcf_ife_encode() must make sure ife_encode() does not return NULL.
syzbot reported:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166
CPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full)
Call Trace:
<TASK>
ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101
tcf_ife_encode net/sched/act_ife.c:841 [inline]
tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877
tc_act include/net/tc_wrapper.h:130 [inline]
tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152
tcf_exts_exec include/net/pkt_cls.h:349 [inline]
mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42
tc_classify include/net/tc_wrapper.h:197 [inline]
__tcf_classify net/sched/cls_api.c:1764 [inline]
tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860
multiq_classify net/sched/sch_multiq.c:39 [inline]
multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66
dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147
__dev_xmit_skb net/core/dev.c:4262 [inline]
__dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798
Severity
5.5 (Medium)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 4ef2c77851676b7ed106f0c47755bee9eeec9a40
(git)
Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < dd9442aedbeae87c44cc64c0ee41abd296dc008b (git) Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 1440d749fe49c8665da6f744323b1671d25a56a0 (git) Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 03710cebfc0bcfe247a9e04381e79ea33896e278 (git) Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 374915dfc932adf57712df3be010667fd1190e3c (git) Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 6c75fed55080014545f262b7055081cec4768b20 (git) Affected: 295a6e06d21e1f469c9f38b00125a13b60ad4e7c , < 27880b0b0d35ad1c98863d09788254e36f874968 (git) |
guessed | |
| Linux | Linux |
Affected:
4.11
Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.249 , ≤ 5.10.* (semver) Unaffected: 5.15.199 , ≤ 5.15.* (semver) Unaffected: 6.1.162 , ≤ 6.1.* (semver) Unaffected: 6.6.122 , ≤ 6.6.* (semver) Unaffected: 6.12.68 , ≤ 6.12.* (semver) Unaffected: 6.18.8 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
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},
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},
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}
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}
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ife: avoid possible NULL deref\n\ntcf_ife_encode() must make sure ife_encode() does not return NULL.\n\nsyzbot reported:\n\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166\nCPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full)\nCall Trace:\n \u003cTASK\u003e\n ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101\n tcf_ife_encode net/sched/act_ife.c:841 [inline]\n tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877\n tc_act include/net/tc_wrapper.h:130 [inline]\n tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152\n tcf_exts_exec include/net/pkt_cls.h:349 [inline]\n mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42\n tc_classify include/net/tc_wrapper.h:197 [inline]\n __tcf_classify net/sched/cls_api.c:1764 [inline]\n tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860\n multiq_classify net/sched/sch_multiq.c:39 [inline]\n multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66\n dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147\n __dev_xmit_skb net/core/dev.c:4262 [inline]\n __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798"
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},
{
"url": "https://git.kernel.org/stable/c/27880b0b0d35ad1c98863d09788254e36f874968"
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],
"title": "net/sched: act_ife: avoid possible NULL deref",
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"cveId": "CVE-2026-23064",
"datePublished": "2026-02-04T16:07:46.329Z",
"dateReserved": "2026-01-13T15:37:45.953Z",
"dateUpdated": "2026-05-11T21:59:18.219Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
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"cve": "CVE-2026-23064",
"date": "2026-09-15",
"epss": "0.00128",
"percentile": "0.02754"
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-23064\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:17.093\",\"lastModified\":\"2026-06-17T10:20:47.913\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: act_ife: avoid possible NULL deref\\n\\ntcf_ife_encode() must make sure ife_encode() does not return NULL.\\n\\nsyzbot reported:\\n\\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\n RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166\\nCPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full)\\nCall Trace:\\n \u003cTASK\u003e\\n ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101\\n tcf_ife_encode net/sched/act_ife.c:841 [inline]\\n tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877\\n tc_act include/net/tc_wrapper.h:130 [inline]\\n tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152\\n tcf_exts_exec include/net/pkt_cls.h:349 [inline]\\n mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42\\n tc_classify include/net/tc_wrapper.h:197 [inline]\\n __tcf_classify net/sched/cls_api.c:1764 [inline]\\n tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860\\n multiq_classify net/sched/sch_multiq.c:39 [inline]\\n multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66\\n dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147\\n __dev_xmit_skb net/core/dev.c:4262 [inline]\\n __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet/sched: act_ife: evitar posible desreferencia de NULL\\n\\ntcf_ife_encode() debe asegurarse de que ife_encode() no devuelva NULL.\\n\\nsyzbot inform\u00f3:\\n\\nOops: fallo de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\\nKASAN: desreferencia de puntero nulo en el rango [0x0000000000000000-0x0000000000000007]\\n RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166\\nCPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 No contaminado syzkaller #0 PREEMPT(full)\\nTraza de Llamada:\\n \\n ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101\\n tcf_ife_encode net/sched/act_ife.c:841 [inline]\\n tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877\\n tc_act include/net/tc_wrapper.h:130 [inline]\\n tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152\\n tcf_exts_exec include/net/pkt_cls.h:349 [inline]\\n mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42\\n tc_classify include/net/tc_wrapper.h:197 [inline]\\n __tcf_classify net/sched/cls_api.c:1764 [inline]\\n tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860\\n multiq_classify net/sched/sch_multiq.c:39 [inline]\\n multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66\\n dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147\\n __dev_xmit_skb net/core/dev.c:4262 [inline]\\n __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/act_ife.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"4ef2c77851676b7ed106f0c47755bee9eeec9a40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"dd9442aedbeae87c44cc64c0ee41abd296dc008b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"1440d749fe49c8665da6f744323b1671d25a56a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"03710cebfc0bcfe247a9e04381e79ea33896e278\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"374915dfc932adf57712df3be010667fd1190e3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"6c75fed55080014545f262b7055081cec4768b20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"295a6e06d21e1f469c9f38b00125a13b60ad4e7c\",\"lessThan\":\"27880b0b0d35ad1c98863d09788254e36f874968\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/act_ife.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.249\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.199\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.162\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.122\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.68\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.8\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"5.10.249\",\"matchCriteriaId\":\"38F17895-900B-4922-A93D-6EAA1D14927A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.199\",\"matchCriteriaId\":\"A247FBA6-BEB9-484F-B892-DD5517949CCD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.162\",\"matchCriteriaId\":\"6579E0D4-0641-479D-A4C3-0EF618798C55\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.122\",\"matchCriteriaId\":\"8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.68\",\"matchCriteriaId\":\"52F38E19-0FDD-4992-9D6D-D4169D689598\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.8\",\"matchCriteriaId\":\"E65C6E79-7EBE-4C77-93F0-818CF5B38F4E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T07:18:30+00:00",
"cve": "CVE-2026-23064",
"id": "CVE-2026-23064",
"initial_release_date": "2026-02-04T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/sched: act_ife: avoid possible NULL deref",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23064.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-24T02:40:34Z",
"cve": "CVE-2026-23064",
"id": "CVE-2026-23064",
"initial_release_date": "2026-02-05T00:25:24Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "604",
"product_status:known_not_affected": "20",
"product_status:recommended": "318",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-23064",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23064.json",
"version": "31"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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