dmaengine: Fix device kref underflow in dma_chan_put()
In the Linux kernel, the following vulnerability has been resolved: dmaengine: Fix device kref underflow in dma_chan_put() dma_chan_get() takes chan->device->ref only on the slow path: /* no kref on fast path */ if (chan->client_count) { __module_get(owner); chan->client_count++; return 0; } if (!try_module_get(owner)) return -ENODEV; if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero() dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference. The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded. Fix this by dropping device->ref only on the last put, matching the single slow-path get.
CVE-2026-98344
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-2026-98344
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": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "036b527f92570206da4b8c40b38f8d689e29d0f3",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "57f7f1c6827be7d8f80feca48d2125fb91c6f6ed",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "7c3f4ce651d43705f9ec7f778f642a90d5ff4fba",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "de2677e57d3161390d8a508f08cddec6ef7e4b23",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "1a0d9b406febf23054ad595fd47b29325e70fb2d",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "77906ac448d2fa81fa710ae26c0e591ebdc81154",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "44dab659064eb5c10adb0306510eebe848ed592d",
"versionType": "git"
}
],
"programFiles": [
"drivers/dma/dmaengine.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/dma/dmaengine.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98344
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38423 · Revision 1
- Added to Heist Feed
- Publisher date