CVE-2026-64421: media: nxp: imx8-isi: Fix use-after-free on remove
Greg Kroah-Hartman <[email protected]> Sat, 25 Jul 2026 10:50:38 +0200
| Newsgroups | org.kernel.vger.linux-cve-announce |
|---|---|
| Message-ID | <2026072534-CVE-2026-64421-6833@gregkh> |
From: Greg Kroah-Hartman <[email protected]> Description =========== In the Linux kernel, the following vulnerability has been resolved: media: nxp: imx8-isi: Fix use-after-free on remove KASAN reports a slab-use-after-free in __media_entity_remove_link() during rmmod of imx8_isi: BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650 Read of size 2 at addr ffff0000d47cb02a by task rmmod/724 Call trace: __media_entity_remove_link+0x608/0x650 __media_entity_remove_links+0x78/0x144 __media_device_unregister_entity+0x150/0x280 media_device_unregister_entity+0x48/0x68 v4l2_device_unregister_subdev+0x158/0x300 v4l2_async_unbind_subdev_one+0x22c/0x358 v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0 v4l2_async_nf_unregister+0x5c/0x14c mxc_isi_remove+0x124/0x2a0 [imx8_isi] Allocated by task 249: __kmalloc_noprof+0x27c/0x690 mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi] Freed by task 724: kfree+0x1e4/0x5b0 mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi] mxc_isi_remove+0x11c/0x2a0 [imx8_isi] The problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup() before mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media entity pads, but the subsequent v4l2 cleanup still tries to remove media links that reference those pads. Fix this by calling mxc_isi_v4l2_cleanup() before mxc_isi_crossbar_cleanup() to ensure all media entities are properly unregistered while the pads are still valid. The Linux kernel CVE team has assigned CVE-2026-64421 to this issue. Affected and fixed versions =========================== Issue introduced in 6.4 with commit cf21f328fcafacf4f96e7a30ef9dceede1076378 and fixed in 6.6.145 with commit d22fb719654bfde6f682c9f14629f5f9534175b7 Issue introduced in 6.4 with commit cf21f328fcafacf4f96e7a30ef9dceede1076378 and fixed in 6.12.97 with commit ba2aa5d325270cd965c44458c5ff5ab555e6af51 Issue introduced in 6.4 with commit cf21f328fcafacf4f96e7a30ef9dceede1076378 and fixed in 6.18.40 with commit ef382a6baf0a95cf199fdf6bba2fd08e58b0a249 Issue introduced in 6.4 with commit cf21f328fcafacf4f96e7a30ef9dceede1076378 and fixed in 7.1.4 with commit c12a5b2261351cd3b03921ce4720332ff5184b50 Issue introduced in 6.4 with commit cf21f328fcafacf4f96e7a30ef9dceede1076378 and fixed in 7.2-rc1 with commit b670bf89824ede5d07d20bb9bfbafb754846081d 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-2026-64421 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: drivers/media/platform/nxp/imx8-isi/imx8-isi-core.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/d22fb719654bfde6f682c9f14629f5f9534175b7 https://git.kernel.org/stable/c/ba2aa5d325270cd965c44458c5ff5ab555e6af51 https://git.kernel.org/stable/c/ef382a6baf0a95cf199fdf6bba2fd08e58b0a249 https://git.kernel.org/stable/c/c12a5b2261351cd3b03921ce4720332ff5184b50 https://git.kernel.org/stable/c/b670bf89824ede5d07d20bb9bfbafb754846081d