{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53235","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.393Z","datePublished":"2026-06-25T08:39:32.518Z","dateUpdated":"2026-08-05T12:34:24.581Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:34:24.581Z"},"descriptions":[{"lang":"en","value":"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->len by skb_gro_offset\nbut skb->data_len stays unchanged, hitting BUG_ON(skb->len < skb->data_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)->flush = 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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable GRO path processes received IPv4/IPv6 TCP packets in the network stack before socket authentication or routing decisions. A remote peer can send crafted same-flow packets to an exposed interface with fraglist GRO enabled.\nAC:L - Given a vulnerable deployment with rx-gro-list enabled, the attacker controls the packet stream, header layout, checksums, and sequencing needed to reach skb_gro_receive_list(). No race or victim state outside the attacker’s packet timing is required.\nPR:N - The code runs on unauthenticated packet receive before any application or TCP connection authorization. No local account or kernel capability is required for a remote sender.\nUI:N - Exploitation only requires packet delivery to the target network interface. No victim user action is needed.\nS:U - The impact is within the kernel/network stack security authority of the targeted system. There is no VM, IOMMU, or sandbox boundary crossing.\nC:N - The bug triggers an internal skb length invariant failure in __skb_pull() and immediately BUGs. I found no out-of-bounds read, use-after-free, or usable information disclosure primitive before the crash.\nI:N - The vulnerable operation corrupts skb metadata only enough to trip the immediate BUG_ON path. It does not provide an attacker-controlled write or persistent data modification primitive.\nA:H - The reachable failure is BUG() in __skb_pull(), causing a kernel oops/panic or loss of system availability. A remote attacker can repeat the packet sequence to repeatedly crash affected deployments."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/gro.c"],"versions":[{"version":"8d95dc474f85481652a0e422d2f1f079de81f63c","lessThan":"9e636c995b7beeb74ea882968248752821c244c4","status":"affected","versionType":"git"},{"version":"8d95dc474f85481652a0e422d2f1f079de81f63c","lessThan":"0cde3a004119db637b401c54e77536e4145fc0b4","status":"affected","versionType":"git"},{"version":"8d95dc474f85481652a0e422d2f1f079de81f63c","lessThan":"848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac","status":"affected","versionType":"git"},{"version":"8d95dc474f85481652a0e422d2f1f079de81f63c","lessThan":"f2bb3434544454099a5b6dec213567267b05d79d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/gro.c"],"versions":[{"version":"6.10","status":"affected"},{"version":"0","lessThan":"6.10","status":"unaffected","versionType":"semver"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9e636c995b7beeb74ea882968248752821c244c4"},{"url":"https://git.kernel.org/stable/c/0cde3a004119db637b401c54e77536e4145fc0b4"},{"url":"https://git.kernel.org/stable/c/848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac"},{"url":"https://git.kernel.org/stable/c/f2bb3434544454099a5b6dec213567267b05d79d"}],"title":"net: add pskb_may_pull() to skb_gro_receive_list()","x_generator":{"engine":"bippy-1.2.0"}}}}