{"id":"CVE-2026-74734","revision":null,"records":[{"revision":"a1ebcc482eb740c08212aeeeaff19628","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74734","aliases":[],"title":"firewire: ohci: fix NULL pointer dereference in ar_context_release","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirewire: ohci: fix NULL pointer dereference in ar_context_release\n\nDuring the error handling path of the driver's probe function, a NULL\npointer dereference can occur in ar_context_release().\n\nWhen pci_probe() fails early (e.g., if pcim_enable_device() or MMIO mapping\nfails), the devres cleanup mechanism invokes release_ohci(). This function\nunconditionally calls ar_context_release() to clean up the asynchronous\nreceive contexts. However, if ar_context_init() was not yet called,\nctx->ohci remains NULL (as the fw_ohci structure is zero-initialized by\ndevres_alloc()).\n\nar_context_release() immediately dereferences ctx->ohci to get the dev\npointer before checking if the context was actually initialized, leading to\na crash:\n\nOops: general protection fault, probably for non-canonical address\n0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nRIP: 0010:ar_context_release+0x3f/0x380 drivers/firewire/ohci.c:543\nCall Trace:\n release_ohci+0x3f/0x60 drivers/firewire/ohci.c:3567\n release_nodes drivers/base/devres.c:546 [inline]\n devres_release_all+0x1a8/0x260 drivers/base/devres.c:576\n device_unbind_cleanup drivers/base/dd.c:597 [inline]\n really_probe+0x451/0xae0 drivers/base/dd.c:772\n\nTo fix this, move the assignment of the dev pointer after the !ctx->buffer\ncheck. If ctx->buffer is NULL, it indicates that the context was never\nsuccessfully initialized and there is nothing to release, safely avoiding\nthe dereference of the uninitialized ctx->ohci pointer.","state":0,"publishedAt":"2026-08-26T14:36:48.753+00:00","modifiedAt":"2026-10-21T12:46:20.638+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/firewire/ohci.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5716e58aecdd4f7225c2e46ce903a839fc54f22f\",\n \"lessThan\": \"3770a4794a14331c8ca6a674e49c021827521c2c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5716e58aecdd4f7225c2e46ce903a839fc54f22f\",\n \"lessThan\": \"ca2fa74f3200ced6e0a940753ad99844c42ad7c8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5716e58aecdd4f7225c2e46ce903a839fc54f22f\",\n \"lessThan\": \"ed5470771c7ed7f959230c4697f316af83426a90\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5716e58aecdd4f7225c2e46ce903a839fc54f22f\",\n \"lessThan\": \"7d228ba43279de2d191f25e139fad166409c2c06\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5716e58aecdd4f7225c2e46ce903a839fc54f22f\",\n \"lessThan\": \"42d217add8d80d6e7d9f58f80d11ea9b07ea113e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/firewire/ohci.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.5\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.5\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.160\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.114\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.46\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.10\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/3770a4794a14331c8ca6a674e49c021827521c2c","https://git.kernel.org/stable/c/ca2fa74f3200ced6e0a940753ad99844c42ad7c8","https://git.kernel.org/stable/c/ed5470771c7ed7f959230c4697f316af83426a90","https://git.kernel.org/stable/c/7d228ba43279de2d191f25e139fad166409c2c06","https://git.kernel.org/stable/c/42d217add8d80d6e7d9f58f80d11ea9b07ea113e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74734","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74734","identifiers":["CVE-2026-74734"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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