| 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-2024-47668: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() |
| |
| If we need to increase the tree depth, allocate a new node, and then |
| race with another thread that increased the tree depth before us, we'll |
| still have a preallocated node that might be used later. |
| |
| If we then use that node for a new non-root node, it'll still have a |
| pointer to the old root instead of being zeroed - fix this by zeroing it |
| in the cmpxchg failure path. |
| |
| The Linux kernel CVE team has assigned CVE-2024-47668 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.284 with commit 0f27f4f445390cb7f73d4209cb2bf32834dc53da |
| Fixed in 5.10.226 with commit 99418ec776a39609f50934720419e0b464ca2283 |
| Fixed in 5.15.167 with commit ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169 |
| Fixed in 6.1.110 with commit ebeff038744c498a036e7a92eb8e433ae0a386d7 |
| Fixed in 6.6.51 with commit d942e855324a60107025c116245095632476613e |
| Fixed in 6.10.10 with commit 0f078f8ca93b28a34e20bd050f12cd4efeee7c0f |
| Fixed in 6.11 with commit b2f11c6f3e1fc60742673b8675c95b78447f3dae |
| |
| 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-2024-47668 |
| 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: |
| lib/generic-radix-tree.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/0f27f4f445390cb7f73d4209cb2bf32834dc53da |
| https://git.kernel.org/stable/c/99418ec776a39609f50934720419e0b464ca2283 |
| https://git.kernel.org/stable/c/ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169 |
| https://git.kernel.org/stable/c/ebeff038744c498a036e7a92eb8e433ae0a386d7 |
| https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e |
| https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f |
| https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae |
