{"id":"CVE-2026-53158","state":"PUBLISHED","title":"misc: fastrpc: Fix NULL pointer dereference in rpmsg callback","description":"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.","publishedAt":"2026-06-25T08:38:40.818Z","updatedAt":"2026-07-04T11:50:56.161Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"a3d91218ccca1e990bfb737b5a6da23f0afba22b","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"0d8c64511fd45690c5326f013710efcb4f73a97e","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"150bf6f1193c69252580c19d3b3cd631ddce61d7","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"8fb4a23df5b7c02929b62e5dbc270ec7c42b8134","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"4bfdf0a9855df55e9e031ca6a25b855820590c70","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"d5de9cb5355db36438edc621dde3673e3f235767","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"d77583ca33299fede0c194744ef2284e7ba5b763","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"5401fb4fe10fac6134c308495df18ed74aebb9c4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.10.260","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.211","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.177","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"]}],"references":["https://git.kernel.org/stable/c/a3d91218ccca1e990bfb737b5a6da23f0afba22b","https://git.kernel.org/stable/c/0d8c64511fd45690c5326f013710efcb4f73a97e","https://git.kernel.org/stable/c/150bf6f1193c69252580c19d3b3cd631ddce61d7","https://git.kernel.org/stable/c/8fb4a23df5b7c02929b62e5dbc270ec7c42b8134","https://git.kernel.org/stable/c/4bfdf0a9855df55e9e031ca6a25b855820590c70","https://git.kernel.org/stable/c/d5de9cb5355db36438edc621dde3673e3f235767","https://git.kernel.org/stable/c/d77583ca33299fede0c194744ef2284e7ba5b763","https://git.kernel.org/stable/c/5401fb4fe10fac6134c308495df18ed74aebb9c4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53158.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53158","state":"PUBLISHED","datePublished":"2026-06-25T08:38:40.818Z","dateUpdated":"2026-07-04T11:50:56.161Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.388Z"},"containers":{"cna":{"title":"misc: fastrpc: Fix NULL pointer dereference in rpmsg callback","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"a3d91218ccca1e990bfb737b5a6da23f0afba22b","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"0d8c64511fd45690c5326f013710efcb4f73a97e","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"150bf6f1193c69252580c19d3b3cd631ddce61d7","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"8fb4a23df5b7c02929b62e5dbc270ec7c42b8134","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"4bfdf0a9855df55e9e031ca6a25b855820590c70","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"d5de9cb5355db36438edc621dde3673e3f235767","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"d77583ca33299fede0c194744ef2284e7ba5b763","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","status":"affected","lessThan":"5401fb4fe10fac6134c308495df18ed74aebb9c4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.10.260","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.211","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.177","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a3d91218ccca1e990bfb737b5a6da23f0afba22b"},{"url":"https://git.kernel.org/stable/c/0d8c64511fd45690c5326f013710efcb4f73a97e"},{"url":"https://git.kernel.org/stable/c/150bf6f1193c69252580c19d3b3cd631ddce61d7"},{"url":"https://git.kernel.org/stable/c/8fb4a23df5b7c02929b62e5dbc270ec7c42b8134"},{"url":"https://git.kernel.org/stable/c/4bfdf0a9855df55e9e031ca6a25b855820590c70"},{"url":"https://git.kernel.org/stable/c/d5de9cb5355db36438edc621dde3673e3f235767"},{"url":"https://git.kernel.org/stable/c/d77583ca33299fede0c194744ef2284e7ba5b763"},{"url":"https://git.kernel.org/stable/c/5401fb4fe10fac6134c308495df18ed74aebb9c4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-04T11:50:56.161Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.10.260"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.15.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.1.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}