riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args
In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args On RV64, the ABI requires sign-extension for signed 1-byte and 2-byte kfunc args. However, the RV64 JIT currently does not perform sign-extension for such kfunc args. Before commit 7ce090afbf72 ("bpf: Infer zext_dst based on static register liveness analysis"), state pruning could potentially omit zero-extension of 32-bit subregisters, which inadvertently masked the above issue by making the args appear as if they had been properly sign-extended. After that commit, the problem is exposed, causing the kfunc_call/kfunc_call_test4 selftest to fail. Fix this by extending the existing sign-extension logic to handle signed 1-byte and 2-byte kfunc args as well.
CVE-2026-90195
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-2026-90195
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": "443574b033876c85a35de4c65c14f7fe092222b2",
"lessThan": "555fc6f1caf00ce7005e732b688da26c0dc3c5c5",
"versionType": "git"
},
{
"status": "affected",
"version": "443574b033876c85a35de4c65c14f7fe092222b2",
"lessThan": "801ae90f8ce099187e6224cec7d72d07a4df0324",
"versionType": "git"
},
{
"status": "affected",
"version": "443574b033876c85a35de4c65c14f7fe092222b2",
"lessThan": "71dbd143be598954ae103feadd12692aeb0f2f88",
"versionType": "git"
},
{
"status": "affected",
"version": "443574b033876c85a35de4c65c14f7fe092222b2",
"lessThan": "f2aaa621591093cfe8224a25ef2f04a3b1e304b0",
"versionType": "git"
}
],
"programFiles": [
"arch/riscv/net/bpf_jit_comp64.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/riscv/net/bpf_jit_comp64.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90195
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36573 · Revision 1
- Added to Heist Feed
- Publisher date