Description
In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 90dd2f1b7342b9a671a5ea4160f408037b92b118affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 871619c2b78fdfe05afb4e8ba548678687beb812affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7828e9363ac4d23b02419bf2a45b9f1d9fb35646affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6abb510251e75f875797d8983a830e6731fa281caffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f64079bef6a8a7823358c3f352ea29a617844636affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 383d516a0ebc8641372b521c8cb717f0f1834831affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e563b01208f4d1f609bcab13333b6c0e24ce6a01affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.4.291 to ≤ 5.4.*unaffected5.10.235 to ≤ 5.10.*unaffected5.15.179 to ≤ 5.15.*unaffected6.1.129 to ≤ 6.1.*unaffected6.6.79 to ≤ 6.6.*unaffected6.12.16 to ≤ 6.12.*unaffected6.13.4 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 ↗
- https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118 ↗
- https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812 ↗
- https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646 ↗
- https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c ↗
- https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636 ↗
- https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831 ↗
- https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01 ↗
- https://project-zero.issues.chromium.org/issues/395107243 ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗