CVE-2026-43203 (GCVE-0-2026-43203)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:19
VLAI
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)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
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)
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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)
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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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}


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  • 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.
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