CVE-2026-98380 (GCVE-0-2026-98380)
Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-09 07:34
VLAI
EPSS
VEX
Title
net/sched: reject IDR error pointers when deleting actions
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/sched: reject IDR error pointers when deleting actions
tcf_action_delete() drops the reference held by its lookup before calling
tcf_idr_delete_index() with the saved action index. An unlocked
classifier can remove that action and reserve the same IDR slot with
ERR_PTR(-EBUSY) in between.
tcf_idr_delete_index() only checks the lookup result for NULL. It
therefore treats the reservation as a tc_action and dereferences
tcfa_bindcnt. A hardware execution breakpoint was used to schedule the
interleaving without changing the kernel source. KASAN reported this
decoded trace:
BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010
Read of size 4 at addr 0000000000000010 by task poc/150
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002
RIP: tca_action_gd+0x5c0/0x1010:
arch_atomic_read at arch/x86/include/asm/atomic.h:23
raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457
atomic_read at include/linux/atomic/atomic-instrumented.h:33
tcf_idr_delete_index at net/sched/act_api.c:766
tcf_action_delete at net/sched/act_api.c:1859
tcf_del_notify at net/sched/act_api.c:2014
tca_action_gd at net/sched/act_api.c:2064
R13: 0000000000000010 R15: fffffffffffffff0
Kernel panic - not syncing: Fatal exception
R15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces
the address in R13. With the guard applied, the same reproducer returned
-ENOENT without a KASAN report or panic. Treat error pointers as absent
and return -ENOENT.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0190c1d452a91c38a3462abdd81752be1b9006a8 , < 39b751a210bf61a374afa82749afc7a77a08bf1d
(git)
Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < dd80a7519824b72c8fcfd3cc50cb93f7e2d90923 (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < 6bf076258aac4e0af69ef317656c31ce6444d647 (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < 6c9f07bf8800171de2cd3f02815cebe1f4d45f2d (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < 259caa711b7688365676442e2fdb286b8aceaa80 (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < 968550a439f64bd1a6c0d88efb92e4f082f84a26 (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < a9551f26287debe6d8aa6e8841974661065b975f (git) Affected: 0190c1d452a91c38a3462abdd81752be1b9006a8 , < c82b797abe668d0b668601a93ba2c0b071a63574 (git) |
guessed | |
| Linux | Linux |
Affected:
4.19
Unaffected: 0 , < 4.19 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.55 , ≤ 6.18.* (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3-rc5 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
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"version": "5.10.271",
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},
{
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"status": "unaffected",
"version": "5.15.222",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.158",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.112",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc5",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.271",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
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},
{
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{
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"versionStartIncluding": "4.19",
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},
{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: reject IDR error pointers when deleting actions\n\ntcf_action_delete() drops the reference held by its lookup before calling\ntcf_idr_delete_index() with the saved action index. An unlocked\nclassifier can remove that action and reserve the same IDR slot with\nERR_PTR(-EBUSY) in between.\n\ntcf_idr_delete_index() only checks the lookup result for NULL. It\ntherefore treats the reservation as a tc_action and dereferences\ntcfa_bindcnt. A hardware execution breakpoint was used to schedule the\ninterleaving without changing the kernel source. KASAN reported this\ndecoded trace:\n\n BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010\n Read of size 4 at addr 0000000000000010 by task poc/150\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002\n RIP: tca_action_gd+0x5c0/0x1010:\n arch_atomic_read at arch/x86/include/asm/atomic.h:23\n raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457\n atomic_read at include/linux/atomic/atomic-instrumented.h:33\n tcf_idr_delete_index at net/sched/act_api.c:766\n tcf_action_delete at net/sched/act_api.c:1859\n tcf_del_notify at net/sched/act_api.c:2014\n tca_action_gd at net/sched/act_api.c:2064\n R13: 0000000000000010 R15: fffffffffffffff0\n Kernel panic - not syncing: Fatal exception\n\nR15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces\nthe address in R13. With the guard applied, the same reproducer returned\n-ENOENT without a KASAN report or panic. Treat error pointers as absent\nand return -ENOENT."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-09T07:34:20.218Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d"
},
{
"url": "https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923"
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"url": "https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647"
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"url": "https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d"
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{
"url": "https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80"
},
{
"url": "https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26"
},
{
"url": "https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f"
},
{
"url": "https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574"
}
],
"title": "net/sched: reject IDR error pointers when deleting actions",
"x_generator": {
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}
}
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"cveMetadata": {
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"cveId": "CVE-2026-98380",
"datePublished": "2026-10-09T07:34:20.218Z",
"dateReserved": "2026-09-25T10:25:14.345Z",
"dateUpdated": "2026-10-09T07:34:20.218Z",
"state": "PUBLISHED"
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},
{
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]
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: reject IDR error pointers when deleting actions\n\ntcf_action_delete() drops the reference held by its lookup before calling\ntcf_idr_delete_index() with the saved action index. An unlocked\nclassifier can remove that action and reserve the same IDR slot with\nERR_PTR(-EBUSY) in between.\n\ntcf_idr_delete_index() only checks the lookup result for NULL. It\ntherefore treats the reservation as a tc_action and dereferences\ntcfa_bindcnt. A hardware execution breakpoint was used to schedule the\ninterleaving without changing the kernel source. KASAN reported this\ndecoded trace:\n\n BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010\n Read of size 4 at addr 0000000000000010 by task poc/150\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002\n RIP: tca_action_gd+0x5c0/0x1010:\n arch_atomic_read at arch/x86/include/asm/atomic.h:23\n raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457\n atomic_read at include/linux/atomic/atomic-instrumented.h:33\n tcf_idr_delete_index at net/sched/act_api.c:766\n tcf_action_delete at net/sched/act_api.c:1859\n tcf_del_notify at net/sched/act_api.c:2014\n tca_action_gd at net/sched/act_api.c:2064\n R13: 0000000000000010 R15: fffffffffffffff0\n Kernel panic - not syncing: Fatal exception\n\nR15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces\nthe address in R13. With the guard applied, the same reproducer returned\n-ENOENT without a KASAN report or panic. Treat error pointers as absent\nand return -ENOENT."
}
],
"id": "CVE-2026-98380",
"lastModified": "2026-10-09T08:16:56.400",
"metrics": {},
"published": "2026-10-09T08:16:56.400",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80"
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"url": "https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d"
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"url": "https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647"
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"url": "https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d"
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"url": "https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26"
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{
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{
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"url": "https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
}
}
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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