{"id":"CVE-2026-53158","summary":"misc: fastrpc: Fix NULL pointer dereference in rpmsg callback","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix NULL pointer dereference in rpmsg callback\n\nA NULL pointer dereference was observed on Hawi at boot when the DSP\nsends a glink message before fastrpc_rpmsg_probe() has completed\ninitialization:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000178\n  pc : _raw_spin_lock_irqsave+0x34/0x8c\n  lr : fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc]\n  ...\n  Call trace:\n   _raw_spin_lock_irqsave+0x34/0x8c (P)\n   fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc]\n   qcom_glink_native_rx+0x538/0x6a4\n   qcom_glink_smem_intr+0x14/0x24 [qcom_glink_smem]\n\nThe faulting address 0x178 corresponds to the lock variable inside\nstruct fastrpc_channel_ctx, confirming that cctx is NULL when\nfastrpc_rpmsg_callback() attempts to take the spinlock.\n\nThere are two issues here. First, dev_set_drvdata() is called before\nspin_lock_init() and idr_init(), leaving a window where the callback\ncan retrieve a valid cctx pointer but operate on an uninitialized\nspinlock. Second, the rpmsg channel becomes live as soon as the driver\nis bound, so fastrpc_rpmsg_callback() can fire before dev_set_drvdata()\nis called at all, resulting in dev_get_drvdata() returning NULL.\n\nFix both issues by moving all cctx initialization ahead of\ndev_set_drvdata() so the structure is fully initialized before it\nbecomes visible to the callback, and add a NULL check in\nfastrpc_rpmsg_callback() as a guard against any remaining window.","modified":"2026-07-09T18:31:08.036020411Z","published":"2026-06-25T08:38:40.818Z","related":["CGA-x25j-x7h8-pf7m"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53158.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d8c64511fd45690c5326f013710efcb4f73a97e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/150bf6f1193c69252580c19d3b3cd631ddce61d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4bfdf0a9855df55e9e031ca6a25b855820590c70"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5401fb4fe10fac6134c308495df18ed74aebb9c4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8fb4a23df5b7c02929b62e5dbc270ec7c42b8134"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3d91218ccca1e990bfb737b5a6da23f0afba22b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5de9cb5355db36438edc621dde3673e3f235767"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d77583ca33299fede0c194744ef2284e7ba5b763"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53158.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53158"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04"},{"fixed":"a3d91218ccca1e990bfb737b5a6da23f0afba22b"},{"fixed":"0d8c64511fd45690c5326f013710efcb4f73a97e"},{"fixed":"150bf6f1193c69252580c19d3b3cd631ddce61d7"},{"fixed":"8fb4a23df5b7c02929b62e5dbc270ec7c42b8134"},{"fixed":"4bfdf0a9855df55e9e031ca6a25b855820590c70"},{"fixed":"d5de9cb5355db36438edc621dde3673e3f235767"},{"fixed":"d77583ca33299fede0c194744ef2284e7ba5b763"},{"fixed":"5401fb4fe10fac6134c308495df18ed74aebb9c4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53158.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.1.0"},{"fixed":"5.10.260"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.211"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.177"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53158.json"}}],"schema_version":"1.7.5"}