| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-38554: ax25: Fix reference count leak issue of net_device |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ax25: Fix reference count leak issue of net_device |
| |
| There is a reference count leak issue of the object "net_device" in |
| ax25_dev_device_down(). When the ax25 device is shutting down, the |
| ax25_dev_device_down() drops the reference count of net_device one |
| or zero times depending on if we goto unlock_put or not, which will |
| cause memory leak. |
| |
| In order to solve the above issue, decrease the reference count of |
| net_device after dev->ax25_ptr is set to null. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38554 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.17 with commit d01ffb9eee4af165d83b08dd73ebdf9fe94a519b and fixed in 6.1.93 with commit 3ec437f9bbae68e9b38115c4c91de995f73f6bad |
| Issue introduced in 5.17 with commit d01ffb9eee4af165d83b08dd73ebdf9fe94a519b and fixed in 6.6.33 with commit 965d940fb7414b310a22666503d2af69459c981b |
| Issue introduced in 5.17 with commit d01ffb9eee4af165d83b08dd73ebdf9fe94a519b and fixed in 6.8.12 with commit 8bad3a20a27be8d935f2aae08d3c6e743754944a |
| Issue introduced in 5.17 with commit d01ffb9eee4af165d83b08dd73ebdf9fe94a519b and fixed in 6.9.3 with commit eef95df9b752699bddecefa851f64858247246e9 |
| Issue introduced in 5.17 with commit d01ffb9eee4af165d83b08dd73ebdf9fe94a519b and fixed in 6.10 with commit 36e56b1b002bb26440403053f19f9e1a8bc075b2 |
| Issue introduced in 4.14.277 with commit ef0a2a0565727a48f2e36a2c461f8b1e3a61922d |
| Issue introduced in 4.19.240 with commit e2b558fe507a1ed4c43db2b0057fc6e41f20a14c |
| Issue introduced in 5.4.190 with commit 418993bbaafb0cd48f904ba68eeda052d624c821 |
| Issue introduced in 5.10.112 with commit 5ea00fc60676c0eebfa8560ec461209d638bca9d |
| Issue introduced in 5.15.35 with commit 9af0fd5c4453a44c692be0cbb3724859b75d739b |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-38554 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/ax25/ax25_dev.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/3ec437f9bbae68e9b38115c4c91de995f73f6bad |
| https://git.kernel.org/stable/c/965d940fb7414b310a22666503d2af69459c981b |
| https://git.kernel.org/stable/c/8bad3a20a27be8d935f2aae08d3c6e743754944a |
| https://git.kernel.org/stable/c/eef95df9b752699bddecefa851f64858247246e9 |
| https://git.kernel.org/stable/c/36e56b1b002bb26440403053f19f9e1a8bc075b2 |
