nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone Commit 25e5cb780e62 ("nvme-tcp: fix possible crash in write_zeroes processing") established that blk_rq_payload_bytes() must not be read without first checking blk_rq_nr_phys_segments(), and recorded the result in nvme_tcp_setup_cmd_pdu() as req->data_len. The receive side was left as it was. The two differ for REQ_OP_WRITE_ZEROES, which has no physical segments but a non-zero blk_rq_bytes(), so setup leaves req->iter untouched while the receive gate lets a C2HData through and nvme_tcp_recv_data() copies into whatever the previous command on that tag left there. The driver-private area is zeroed only when the tag set is allocated. Reproduced with a test target that leaves a residual iterator on a tag and then sends a C2HData for a WRITE_ZEROES command on the same tag: BUG: KASAN: wild-memory-access in _copy_to_iter+0x642/0x1330 Write of size 512 at addr ffe728c2175dfa81 by task kworker/0:1H/103 CPU: 0 UID: 0 PID: 103 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: nvme_tcp_wq nvme_tcp_io_work Call Trace: dump_stack_lvl+0x53/0x70 kasan_report+0xce/0x100 ? _copy_to_iter+0x642/0x1330 kasan_check_range+0x105/0x1b0 __asan_memcpy+0x3c/0x60 _copy_to_iter+0x642/0x1330 ? __pfx_sock_has_perm+0x
CVE-2026-89482
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-2026-89482
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": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "32ea8ce96b9bd797c59c351ce490ffd97adaa8c0",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "7ed0b61bbc145988be292c4d3ec580aebd8d2bcd",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "b36161701cb366f416afdcf70771d432a7c74753",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "6a01b58263108eaf9869bb6f82f07709240c6589",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "641ad3a30ba560f0a9a610376c568d7b75d2a2aa",
"versionType": "git"
},
{
"status": "affected",
"version": "25e5cb780e62bde432b401f312bb847edc78b432",
"lessThan": "3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36",
"versionType": "git"
},
{
"status": "affected",
"version": "f507ae6e33cbe56c4e3fe000434fc0ecc263d098",
"versionType": "git"
},
{
"status": "affected",
"version": "b1458c16f4e26e87492e58e4d24a1873bd09232a",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.36",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.6.8",
"lessThan": "5.7",
"versionType": "semver"
}
],
"programFiles": [
"drivers/nvme/host/tcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/host/tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89482
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #35010 · Revision 1
- Added to Heist Feed
- Publisher date