CVE-2026-43203 (GCVE-0-2026-43203)
Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-08-05 12:26
VLAI
EPSS
VEX
Title
atm: fore200e: fix use-after-free in tasklets during device removal
Summary
In the Linux kernel, the following vulnerability has been resolved:
atm: fore200e: fix use-after-free in tasklets during device removal
When the PCA-200E or SBA-200E adapter is being detached, the fore200e
is deallocated. However, the tx_tasklet or rx_tasklet may still be running
or pending, leading to use-after-free bug when the already freed fore200e
is accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet().
One of the race conditions can occur as follows:
CPU 0 (cleanup) | CPU 1 (tasklet)
fore200e_pca_remove_one() | fore200e_interrupt()
fore200e_shutdown() | tasklet_schedule()
kfree(fore200e) | fore200e_tx_tasklet()
| fore200e-> // UAF
Fix this by ensuring tx_tasklet or rx_tasklet is properly canceled before
the fore200e is released. Add tasklet_kill() in fore200e_shutdown() to
synchronize with any pending or running tasklets. Moreover, since
fore200e_reset() could prevent further interrupts or data transfers,
the tasklet_kill() should be placed after fore200e_reset() to prevent
the tasklet from being rescheduled in fore200e_interrupt(). Finally,
it only needs to do tasklet_kill() when the fore200e state is greater
than or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized
in earlier states. In a word, the tasklet_kill() should be placed in
the FORE200E_STATE_IRQ branch within the switch...case structure.
This bug was identified through static analysis.
Severity
7.5 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 91f25749aaf57c47ae1e12478144e6ea8c8562f2
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 73fbc5d1a9ccb626937500bbd67136f077d8237b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aba0b4bc09376dfc3d53c826514fe38fc8337f52 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e075ec9b08f862dade8011481058f7eb5f716c57 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 97900f512252a59f23d6ce4ab215cc88fed66e68 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5189368f10903956be05062d160b2804bf5e5016 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8930878101cd40063888a68af73b1b0f8b6c79bc (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: fore200e: fix use-after-free in tasklets during device removal\n\nWhen the PCA-200E or SBA-200E adapter is being detached, the fore200e\nis deallocated. However, the tx_tasklet or rx_tasklet may still be running\nor pending, leading to use-after-free bug when the already freed fore200e\nis accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet().\n\nOne of the race conditions can occur as follows:\n\nCPU 0 (cleanup) | CPU 1 (tasklet)\nfore200e_pca_remove_one() | fore200e_interrupt()\n fore200e_shutdown() | tasklet_schedule()\n kfree(fore200e) | fore200e_tx_tasklet()\n | fore200e-\u003e // UAF\n\nFix this by ensuring tx_tasklet or rx_tasklet is properly canceled before\nthe fore200e is released. Add tasklet_kill() in fore200e_shutdown() to\nsynchronize with any pending or running tasklets. Moreover, since\nfore200e_reset() could prevent further interrupts or data transfers,\nthe tasklet_kill() should be placed after fore200e_reset() to prevent\nthe tasklet from being rescheduled in fore200e_interrupt(). Finally,\nit only needs to do tasklet_kill() when the fore200e state is greater\nthan or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized\nin earlier states. In a word, the tasklet_kill() should be placed in\nthe FORE200E_STATE_IRQ branch within the switch...case structure.\n\nThis bug was identified through static analysis."
}
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"version": "3.1"
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"value": "AV:N - ATM link traffic from a remote peer can cause the adapter IRQ path (`fore200e_interrupt()`) to schedule the vulnerable RX/TX tasklets. The freeing side occurs during adapter removal, but the attacker-controlled stimulus reaches the vulnerable tasklet path over the network-facing ATM device.\nAC:H - The bug requires the non-default `CONFIG_ATM_FORE200E_USE_TASKLET` configuration and a removal event overlapping a pending or running tasklet. The remote attacker can keep interrupts likely, but does not fully control the removal side.\nPR:N - A remote ATM peer does not need credentials or local privileges on the vulnerable host to generate traffic that posts adapter interrupts. Local sysfs unbind/module removal would require real root, but the highest-severity reasonable scenario uses unauthenticated remote traffic coinciding with victim-initiated removal.\nUI:R - Network traffic alone does not free `struct fore200e`; a user/admin action or physical hotplug/removal event must detach, unbind, or remove the adapter. Once removal occurs, pending tasklets can access the freed structure.\nS:U - The corruption occurs within the kernel/driver context and affects resources under the same kernel security authority. There is no VM escape, IOMMU bypass, or cross-scope boundary indicated.\nC:H - This is a use-after-free of the driver\u2019s per-device structure, and the tasklets dereference freed pointers and queues after teardown. Per the kernel scoring guidance, UAF memory corruption is treated as enabling high confidentiality impact.\nI:H - The freed `struct fore200e` can be reallocated or corrupted before tasklet execution, creating a plausible control-flow or arbitrary-write primitive. Per the kernel scoring guidance, UAF memory corruption warrants high integrity impact.\nA:H - The tasklets dereference freed driver state after `kfree(fore200e)`, which can directly cause kernel oops, panic, or hang. Any kernel crash from this UAF is high availability impact."
}
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"url": "https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2"
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"datePublished": "2026-05-06T11:28:08.949Z",
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However, the tx_tasklet or rx_tasklet may still be running\\nor pending, leading to use-after-free bug when the already freed fore200e\\nis accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet().\\n\\nOne of the race conditions can occur as follows:\\n\\nCPU 0 (cleanup) | CPU 1 (tasklet)\\nfore200e_pca_remove_one() | fore200e_interrupt()\\n fore200e_shutdown() | tasklet_schedule()\\n kfree(fore200e) | fore200e_tx_tasklet()\\n | fore200e-\u003e // UAF\\n\\nFix this by ensuring tx_tasklet or rx_tasklet is properly canceled before\\nthe fore200e is released. Add tasklet_kill() in fore200e_shutdown() to\\nsynchronize with any pending or running tasklets. Moreover, since\\nfore200e_reset() could prevent further interrupts or data transfers,\\nthe tasklet_kill() should be placed after fore200e_reset() to prevent\\nthe tasklet from being rescheduled in fore200e_interrupt(). 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In a word, the tasklet_kill() should be placed in\\nthe FORE200E_STATE_IRQ branch within the switch...case structure.\\n\\nThis bug was identified through static analysis.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/atm/fore200e.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"91f25749aaf57c47ae1e12478144e6ea8c8562f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"73fbc5d1a9ccb626937500bbd67136f077d8237b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"aba0b4bc09376dfc3d53c826514fe38fc8337f52\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e075ec9b08f862dade8011481058f7eb5f716c57\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"97900f512252a59f23d6ce4ab215cc88fed66e68\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5189368f10903956be05062d160b2804bf5e5016\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8930878101cd40063888a68af73b1b0f8b6c79bc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/atm/fore200e.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.16\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.6\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.6,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12.1\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"68B6D2AD-7565-4394-B77B-A1EEBCDF590F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.16\",\"matchCriteriaId\":\"B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:lin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"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T11:35:39+00:00",
"cve": "CVE-2026-43203",
"id": "CVE-2026-43203",
"initial_release_date": "2026-05-06T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: atm: fore200e: fix use-after-free in tasklets during device removal",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43203.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-11T01:19:57Z",
"cve": "CVE-2026-43203",
"id": "CVE-2026-43203",
"initial_release_date": "2026-05-07T02:17:16Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "703",
"product_status:known_not_affected": "17",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43203",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43203.json",
"version": "11"
}
}
}
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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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