firewire: ohci: fix NULL pointer dereference in ar_context_release
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 i
CVE-2026-74734
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74734
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
"lessThan": "3770a4794a14331c8ca6a674e49c021827521c2c",
"versionType": "git"
},
{
"status": "affected",
"version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
"lessThan": "ca2fa74f3200ced6e0a940753ad99844c42ad7c8",
"versionType": "git"
},
{
"status": "affected",
"version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
"lessThan": "ed5470771c7ed7f959230c4697f316af83426a90",
"versionType": "git"
},
{
"status": "affected",
"version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
"lessThan": "7d228ba43279de2d191f25e139fad166409c2c06",
"versionType": "git"
},
{
"status": "affected",
"version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
"lessThan": "42d217add8d80d6e7d9f58f80d11ea9b07ea113e",
"versionType": "git"
}
],
"programFiles": [
"drivers/firewire/ohci.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/firewire/ohci.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74734
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46597 · Revision 1
- Added to Heist Feed
- Publisher date