net: xps: reject an out of range traffic class
In the Linux kernel, the following vulnerability has been resolved: net: xps: reject an out of range traffic class Only the entries below dev->num_tc are valid in dev->tc_to_txq[], and dev->prio_tc_map[] may only name classes below it. netdev_set_num_tc() lowers dev->num_tc without touching either array. netdev_txq_to_tc() walks all TC_MAX_QUEUE slots and netdev_get_prio_tc_map() returns the entry as it stands, so a leftover entry is handed out as a traffic class >= dev->num_tc. Taking that class from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a negative one and indexes an XPS map sized for dev->num_tc classes: tci = j * num_tc + tc; RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); attr_map[] holds nr_ids * num_tc entries and j runs over the ids named in the mask, so a class that is not below num_tc pushes tci past the end of the map for the last ids and the store overruns it. Any caller that lowers num_tc leaves such entries behind, and mqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than netdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7] still describe txq 1..7. The splat is from an XPS write to txq 2 on a veth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and j == 6 stores one past the end of the 88-byte map: BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954) Write of size 8 at addr ffff88813016bc58 by task xps_oob/634 __netif_set_xps_queue (net/core/dev.c:2954) xps_rxqs_store
CVE-2026-98567
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-2026-98567
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": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "967e10f40a0c6732db299cbe001df0e859196055",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "6ea8f643053f33622f9116e4e1db58306ece45e3",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "9e841723ba482d41ecbf90241c756a16cdfea949",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "2cc1c3977acbffc417fb5b57699d1df3dcffb5fd",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "930318290d8509e864c015fe6c9239470b3c579c",
"versionType": "git"
},
{
"status": "affected",
"version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
"lessThan": "4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910",
"versionType": "git"
}
],
"programFiles": [
"net/core/dev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.10",
"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": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/dev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98567
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38586 · Revision 1
- Added to Heist Feed
- Publisher date