{"apiVersion":"1.0","identifier":"CVE-2026-74734","description":"In the Linux kernel, the following vulnerability has been resolved: firewire: ohci: fix NULL pointer dereference in ar_context_release During the error handling path of the driver-s probe function, a NULL pointer dereference can occur in ar_context_release(). When pci_probe() fails early (e.g., if pcim_enable_device() or MMIO mapping fails), the devres cleanup mechanism invokes release_ohci(). This function unconditionally calls ar_context_release() to clean up the asynchronous receive contexts. However, if ar_context_init() was not yet called, ctx->ohci remains NULL (as the fw_ohci structure is zero-initialized by devres_alloc()). ar_context_release() immediately dereferences ctx->ohci to get the dev pointer before checking if the context was actually initialized, leading to a crash: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:ar_context_release+0x3f/0x380 drivers/firewire/ohci.c:543 Call Trace: release_ohci+0x3f/0x60 drivers/firewire/ohci.c:3567 release_nodes drivers/base/devres.c:546 [inline] devres_release_all+0x1a8/0x260 drivers/base/devres.c:576 device_unbind_cleanup drivers/base/dd.c:597 [inline] really_probe+0x451/0xae0 drivers/base/dd.c:772 To fix this, move the assignment of the dev pointer after the !ctx->buffer check. If ctx->buffer is NULL, it indicates that the context was never successfully initialized and there is nothing to release, safely avoiding the dereference of the uninitialized ctx->ohci pointer.","publishedAt":"2026-08-26T15:16:51","lastModifiedAt":"2026-08-26T15:16:51","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74734","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00173,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74734","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74734","en":"https://www.redsauce.net/en/cves/CVE-2026-74734","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74734","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74734","de":"https://www.redsauce.net/de/cves/CVE-2026-74734","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74734","el":"https://www.redsauce.net/el/cves/CVE-2026-74734"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74734"}}