{"id":"DEBIAN-CVE-2025-21855","details":"In the Linux kernel, the following vulnerability has been resolved:  ibmvnic: Don't reference skb after sending to VIOS  Previously, after successfully flushing the xmit buffer to VIOS, the tx_bytes stat was incremented by the length of the skb.  It is invalid to access the skb memory after sending the buffer to the VIOS because, at any point after sending, the VIOS can trigger an interrupt to free this memory. A race between reading skb-\u003elen and freeing the skb is possible (especially during LPM) and will result in use-after-free:  ==================================================================  BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]  Read of size 4 at addr c00000024eb48a70 by task hxecom/14495  \u003c...\u003e  Call Trace:  [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)  [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0  [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8  [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0  [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]  [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358  \u003c...\u003e  Freed by task 0:  kasan_save_stack+0x34/0x68  kasan_save_track+0x2c/0x50  kasan_save_free_info+0x64/0x108  __kasan_mempool_poison_object+0x148/0x2d4  napi_skb_cache_put+0x5c/0x194  net_tx_action+0x154/0x5b8  handle_softirqs+0x20c/0x60c  do_softirq_own_stack+0x6c/0x88  \u003c...\u003e  The buggy address belongs to the object at c00000024eb48a00 which   belongs to the cache skbuff_head_cache of size 224 ==================================================================","modified":"2026-09-01T16:06:10.225002107Z","published":"2025-03-12T10:15:18.320Z","upstream":["CVE-2025-21855"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-21855"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.133-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21855.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.17-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21855.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.17-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21855.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}