Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 91f25749aaf57c47ae1e12478144e6ea8c8562f2; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 73fbc5d1a9ccb626937500bbd67136f077d8237b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before aba0b4bc09376dfc3d53c826514fe38fc8337f52; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e075ec9b08f862dade8011481058f7eb5f716c57; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 97900f512252a59f23d6ce4ab215cc88fed66e68; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5189368f10903956be05062d160b2804bf5e5016; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8930878101cd40063888a68af73b1b0f8b6c79bc |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2
- https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b
- https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52
- https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57
- https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68
- https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d
- https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016
- https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc