{"id":"CVE-2026-72393","summary":"eth: fbnic: don't cache shinfo across skb realloc","details":"In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: don't cache shinfo across skb realloc\n\nfbnic_tx_lso() calls skb_cow_head() which may reallocate the skb\nincluding the shared info. We can't use the pointer calculated\nbefore the call.\n\n    BUG: KASAN: slab-use-after-free in fbnic_tx_lso.isra.0+0x668/0x8e0\n    Read of size 4 at addr ff110000262edd98 by task swapper/5/0\n    Call Trace:\n     fbnic_tx_lso.isra.0+0x668/0x8e0\n     fbnic_xmit_frame+0x622/0xba0\n     dev_hard_start_xmit+0xf4/0x620\n\n    Allocated by task 8653:\n     __alloc_skb+0x11e/0x5f0\n     alloc_skb_with_frags+0xcc/0x6c0\n     sock_alloc_send_pskb+0x327/0x3f0\n     __ip_append_data+0x188b/0x47a0\n     ip_make_skb+0x24a/0x300\n     udp_sendmsg+0x14d2/0x21e0\n\n    Freed by task 0:\n     kfree+0x123/0x5a0\n     pskb_expand_head+0x36c/0xfa0\n     fbnic_tx_lso.isra.0+0x500/0x8e0\n     fbnic_xmit_frame+0x622/0xba0\n     dev_hard_start_xmit+0xf4/0x620\n     sch_direct_xmit+0x25b/0x1100\n\n    The buggy address belongs to the object at ff110000262edc40\n     which belongs to the cache skbuff_small_head of size 640\n    The buggy address is located 344 bytes inside of\n     freed 640-byte region [ff110000262edc40, ff110000262ede","modified":"2026-08-16T03:48:41.161223460Z","published":"2026-08-15T05:56:21.081Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72393.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21f304c2aae46625e050c28d979f4b9d83faa85e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/62b68b774f06bf52e329f254f0199bc43d350ccf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83df3e2594cd78aa40b1246a19879abb4891945b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72393.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72393"},{"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":"b0b0f52042acb324cd39fbefb2b1ae83af8f8ae1"},{"fixed":"83df3e2594cd78aa40b1246a19879abb4891945b"},{"fixed":"21f304c2aae46625e050c28d979f4b9d83faa85e"},{"fixed":"62b68b774f06bf52e329f254f0199bc43d350ccf"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72393.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72393.json"}}],"schema_version":"1.9.0"}