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Message-ID: <2024061924-CVE-2024-38602-e098@gregkh> Date: Wed, 19 Jun 2024 15:48:25 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-38602: ax25: Fix reference count leak issues of ax25_dev Description =========== In the Linux kernel, the following vulnerability has been resolved: ax25: Fix reference count leak issues of ax25_dev The ax25_addr_ax25dev() and ax25_dev_device_down() exist a reference count leak issue of the object "ax25_dev". Memory leak issue in ax25_addr_ax25dev(): The reference count of the object "ax25_dev" can be increased multiple times in ax25_addr_ax25dev(). This will cause a memory leak. Memory leak issues in ax25_dev_device_down(): The reference count of ax25_dev is set to 1 in ax25_dev_device_up() and then increase the reference count when ax25_dev is added to ax25_dev_list. As a result, the reference count of ax25_dev is 2. But when the device is shutting down. The ax25_dev_device_down() drops the reference count once or twice depending on if we goto unlock_put or not, which will cause memory leak. As for the issue of ax25_addr_ax25dev(), it is impossible for one pointer to be on a list twice. So add a break in ax25_addr_ax25dev(). As for the issue of ax25_dev_device_down(), increase the reference count of ax25_dev once in ax25_dev_device_up() and decrease the reference count of ax25_dev after it is removed from the ax25_dev_list. The Linux kernel CVE team has assigned CVE-2024-38602 to this issue. Affected and fixed versions =========================== Issue introduced in 5.17 with commit d01ffb9eee4a and fixed in 6.1.93 with commit ae467750a376 Issue introduced in 5.17 with commit d01ffb9eee4a and fixed in 6.6.33 with commit 38eb01edfdaa Issue introduced in 5.17 with commit d01ffb9eee4a and fixed in 6.8.12 with commit 81d8240b0a24 Issue introduced in 5.17 with commit d01ffb9eee4a and fixed in 6.9.3 with commit 1ea02699c755 Issue introduced in 5.17 with commit d01ffb9eee4a and fixed in 6.10-rc1 with commit b505e0319852 Issue introduced in 4.14.277 with commit ef0a2a056572 Issue introduced in 4.19.240 with commit e2b558fe507a Issue introduced in 5.4.190 with commit 418993bbaafb Issue introduced in 5.10.112 with commit 5ea00fc60676 Issue introduced in 5.15.35 with commit 9af0fd5c4453 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-2024-38602 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/ae467750a3765dd1092eb29f58247950a2f9b60c https://git.kernel.org/stable/c/38eb01edfdaa1562fa00429be2e33f45383b1b3a https://git.kernel.org/stable/c/81d8240b0a243b3ddd8fa8aa172f1acc2f7cc8f3 https://git.kernel.org/stable/c/1ea02699c7557eeb35ccff2bd822de1b3e09d868 https://git.kernel.org/stable/c/b505e0319852b08a3a716b64620168eab21f4ced
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