{"id":"CVE-2025-39848","summary":"ax25: properly unshare skbs in ax25_kiss_rcv()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nax25: properly unshare skbs in ax25_kiss_rcv()\n\nBernard Pidoux reported a regression apparently caused by commit\nc353e8983e0d (\"net: introduce per netns packet chains\").\n\nskb-\u003edev becomes NULL and we crash in __netif_receive_skb_core().\n\nBefore above commit, different kind of bugs or corruptions could happen\nwithout a major crash.\n\nBut the root cause is that ax25_kiss_rcv() can queue/mangle input skb\nwithout checking if this skb is shared or not.\n\nMany thanks to Bernard Pidoux for his help, diagnosis and tests.\n\nWe had a similar issue years ago fixed with commit 7aaed57c5c28\n(\"phonet: properly unshare skbs in phonet_rcv()\").","modified":"2026-04-02T12:48:10.927941Z","published":"2025-09-19T15:26:21.403Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:3751-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4141-1","openSUSE-SU-2025:20081-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39848.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39848.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39848"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"42b46684e2c78ee052d8c2ee8d9c2089233c9094"},{"fixed":"5b079be1b9da49ad88fc304c874d4be7085f7883"},{"fixed":"2bd0f67212908243ce88e35bf69fa77155b47b14"},{"fixed":"01a2984cb803f2d487b7074f9718db2bf3531f69"},{"fixed":"7d449b7a6c8ee434d10a483feed7c5c50108cf56"},{"fixed":"89064cf534bea4bb28c83fe6bbb26657b19dd5fe"},{"fixed":"b1c71d674a308d2fbc83efcf88bfc4217a86aa17"},{"fixed":"8156210d36a43e76372312c87eb5ea3dbb405a85"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39848.json"}}],"schema_version":"1.7.5"}