irqchip/gic-v3-its: Avoid truncating memory addresses
In the Linux kernel, the following vulnerability has been resolved: irqchip/gic-v3-its: Avoid truncating memory addresses On 32-bit machines with CONFIG_ARM_LPAE, it is possible for lowmem allocations to be backed by addresses physical memory above the 32-bit address limit, as found while experimenting with larger VMSPLIT configurations. This caused the qemu virt model to crash in the GICv3 driver, which allocates the 'itt' object using GFP_KERNEL. Since all memory below the 4GB physical address limit is in ZONE_DMA in this configuration, kmalloc() defaults to higher addresses for ZONE_NORMAL, and the ITS driver stores the physical address in a 32-bit 'unsigned long' variable. Change the itt_addr variable to the correct phys_addr_t type instead, along with all other variables in this driver that hold a physical address. The gicv5 driver correctly uses u64 variables, while all other irqchip drivers don't call virt_to_phys or similar interfaces. It's expected that other device drivers have similar issues, but fixing this one is sufficient for booting a virtio based guest.
CVE-2026-23085
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-2026-23085
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": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "e332b3b69e5b3acf07204a4b185071bab15c2b88",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "e2f9c751f73a2d5bb62d94ab030aec118a811f27",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "85215d633983233809f7d4dad163b953331b8238",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "1b323391560354d8c515de8658b057a1daa82adb",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "084ba3b99f2dfd991ce7e84fb17117319ec3cd9f",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
"lessThan": "8d76a7d89c12d08382b66e2f21f20d0627d14859",
"versionType": "git"
}
],
"programFiles": [
"drivers/irqchip/irq-gic-v3-its.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.249",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.199",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.162",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.122",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.68",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.8",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/irqchip/irq-gic-v3-its.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23085
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #39745 · Revision 1
- Added to Heist Feed
- Publisher date