batman-adv: mcast: linearize skbuff for packet generation
In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: linearize skbuff for packet generation batadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only called (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet() handler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then it will be unshared but not linearized. The SKB_LINEAR_ASSERT() can therefore cause a fatal BUG(). The linearization should happen during the expansion of the head because the scrape function can be hit already during the initial batadv_mcast_forw_mode() selection code: * batadv_interface_tx * batadv_mcast_forw_mode * batadv_mcast_forw_mode_by_count() * batadv_mcast_forw_push() -> calls batadv_mcast_forw_expand_head() before everything else * batadv_mcast_forw_push_tvlvs() * batadv_mcast_forw_push_dests() * batadv_mcast_forw_push_adjust_padding() * batadv_mcast_forw_scrape()
CVE-2026-89950
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-2026-89950
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": "90039133221e33964ccb4a536dad7eb0a372fff7",
"lessThan": "a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e",
"versionType": "git"
},
{
"status": "affected",
"version": "90039133221e33964ccb4a536dad7eb0a372fff7",
"lessThan": "c32e5e25c41201c8c3b796a4ab2c45103187091e",
"versionType": "git"
},
{
"status": "affected",
"version": "90039133221e33964ccb4a536dad7eb0a372fff7",
"lessThan": "2879177539e3ece483a8e5406970373698e9a6c5",
"versionType": "git"
},
{
"status": "affected",
"version": "90039133221e33964ccb4a536dad7eb0a372fff7",
"lessThan": "6a30a59e2660afd03c975f1b8eae6a2301161197",
"versionType": "git"
}
],
"programFiles": [
"net/batman-adv/multicast_forw.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/batman-adv/multicast_forw.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89950
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36391 · Revision 1
- Added to Heist Feed
- Publisher date