| 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-2024-26993: fs: sysfs: Fix reference leak in sysfs_break_active_protection() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| fs: sysfs: Fix reference leak in sysfs_break_active_protection() |
| |
| The sysfs_break_active_protection() routine has an obvious reference |
| leak in its error path. If the call to kernfs_find_and_get() fails then |
| kn will be NULL, so the companion sysfs_unbreak_active_protection() |
| routine won't get called (and would only cause an access violation by |
| trying to dereference kn->parent if it was called). As a result, the |
| reference to kobj acquired at the start of the function will never be |
| released. |
| |
| Fix the leak by adding an explicit kobject_put() call when kn is NULL. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26993 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 4.19.313 with commit f28bba37fe244889b81bb5c508d3f6e5c6e342c5 |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 5.4.275 with commit 57baab0f376bec8f54b0fe6beb8f77a57c228063 |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 5.10.216 with commit 84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17 |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 5.15.157 with commit 43f00210cb257bcb0387e8caeb4b46375d67f30c |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 6.1.88 with commit 5d43e072285e81b0b63cee7189b3357c7768a43b |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 6.6.29 with commit ac107356aabc362aaeb77463e814fc067a5d3957 |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 6.8.8 with commit a4c99b57d43bab45225ba92d574a8683f9edc8e4 |
| Issue introduced in 4.19 with commit 2afc9166f79b8f6da5f347f48515215ceee4ae37 and fixed in 6.9 with commit a90bca2228c0646fc29a72689d308e5fe03e6d78 |
| Issue introduced in 3.16.62 with commit e8a37b2fd5b5087bec6cbbf6946ee3caa712953b |
| Issue introduced in 3.18.121 with commit a6abc93760dd07fcd29760b70e6e7520f22cb288 |
| Issue introduced in 4.4.154 with commit 461a6385e58e8247e6ba2005aa5d1b8d980ee4a2 |
| Issue introduced in 4.9.125 with commit 8a5e02a0f46ea33ed19e48e096a8e8d28e73d10a |
| Issue introduced in 4.14.68 with commit c984f4d1d40a2f349503b3faf946502ccbf02f9f |
| Issue introduced in 4.18.6 with commit 807d1d299a04e9ad9a9dac55419c1137a105254b |
| |
| 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-2024-26993 |
| 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: |
| fs/sysfs/file.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/f28bba37fe244889b81bb5c508d3f6e5c6e342c5 |
| https://git.kernel.org/stable/c/57baab0f376bec8f54b0fe6beb8f77a57c228063 |
| https://git.kernel.org/stable/c/84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17 |
| https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c |
| https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b |
| https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957 |
| https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4 |
| https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78 |
