batman-adv: mcast: linearize skbuff for packet generation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89950
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:05 UTC
Updated2026-09-16 11:17:05 UTC
DescriptionIn 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()

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 90039133221e33964ccb4a536dad7eb0a372fff7 a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e git Not specified
CNA Linux Linux affected 90039133221e33964ccb4a536dad7eb0a372fff7 c32e5e25c41201c8c3b796a4ab2c45103187091e git Not specified
CNA Linux Linux affected 90039133221e33964ccb4a536dad7eb0a372fff7 2879177539e3ece483a8e5406970373698e9a6c5 git Not specified
CNA Linux Linux affected 90039133221e33964ccb4a536dad7eb0a372fff7 6a30a59e2660afd03c975f1b8eae6a2301161197 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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