{"id":"CVE-2026-53235","summary":"net: add pskb_may_pull() to skb_gro_receive_list()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add pskb_may_pull() to skb_gro_receive_list()\n\nskb_gro_receive_list() calls skb_pull(skb, skb_gro_offset(skb)) without\nfirst ensuring the data is in the linear area via pskb_may_pull(). When\nthe skb arrives via napi_gro_frags(), skb_headlen can be 0 (all data in\npage fragments) while skb_gro_offset is non-zero (after IP+TCP header\nparsing). The skb_pull() then decrements skb-\u003elen by skb_gro_offset\nbut skb-\u003edata_len stays unchanged, hitting BUG_ON(skb-\u003elen \u003c skb-\u003edata_len)\nin __skb_pull().\n\nThe UDP fraglist GRO path already contains this guard at\nudp_offload.c:749. Adding it to skb_gro_receive_list() itself provides\ncentralized protection for all callers (TCP, UDP, and any future\nprotocols), and ensures the precondition of skb_pull() is satisfied\nbefore it is called.\n\nOn pskb_may_pull() failure, set NAPI_GRO_CB(skb)-\u003eflush = 1 so the\nskb is not held as a new GRO head and is instead delivered through the\nnormal receive path, matching the UDP handling.","modified":"2026-07-10T05:44:30.362933484Z","published":"2026-06-25T08:39:32.518Z","related":["CGA-fjhr-xf4m-gpc5"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53235.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0cde3a004119db637b401c54e77536e4145fc0b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e636c995b7beeb74ea882968248752821c244c4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f2bb3434544454099a5b6dec213567267b05d79d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53235.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53235"},{"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":"8d95dc474f85481652a0e422d2f1f079de81f63c"},{"fixed":"9e636c995b7beeb74ea882968248752821c244c4"},{"fixed":"0cde3a004119db637b401c54e77536e4145fc0b4"},{"fixed":"848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac"},{"fixed":"f2bb3434544454099a5b6dec213567267b05d79d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53235.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53235.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}