{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26665", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.149Z", "datePublished": "2024-04-02T06:22:14.264Z", "dateUpdated": "2026-08-05T11:26:39.967Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:39.967Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: fix out of bounds access when building IPv6 PMTU error\n\nIf the ICMPv6 error is built from a non-linear skb we get the following\nsplat,\n\n BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240\n Read of size 4 at addr ffff88811d402c80 by task netperf/820\n CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543\n ...\n kasan_report+0xd8/0x110\n do_csum+0x220/0x240\n csum_partial+0xc/0x20\n skb_tunnel_check_pmtu+0xeb9/0x3280\n vxlan_xmit_one+0x14c2/0x4080\n vxlan_xmit+0xf61/0x5c00\n dev_hard_start_xmit+0xfb/0x510\n __dev_queue_xmit+0x7cd/0x32a0\n br_dev_queue_push_xmit+0x39d/0x6a0\n\nUse skb_checksum instead of csum_partial who cannot deal with non-linear\nSKBs." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The overread is triggered by an ordinary over-MTU IPv6 packet forwarded out a VXLAN/Geneve device enslaved to a bridge or OVS port, a standard cloud/container overlay topology. The L3 source address is unconstrained (only unspecified/multicast/loopback sources are filtered), so an off-link remote sender whose packet is routed to a workload behind the overlay reaches the vulnerable code.\nAC:L - The attacker only needs to send an IPv6 packet larger than the tunnel's inner MTU; non-linear skbs are the normal case for large frames under GRO, header-split NICs, and virtio-net mergeable buffers, and the reporter reproduced it with plain netperf traffic. No memory-layout luck or attacker-uncontrollable state is required.\nPR:N - There is no capability check, authentication, or credential gate anywhere on the receive-and-bridge-to-tunnel path — the packet is simply forwarded and the ICMPv6 error is built. The attacker needs no account or privileges on the affected host.\nUI:N - Exploitation is entirely packet-driven and happens inside softirq/xmit context with no victim participation. No administrator or user action is needed once the standard bridged-tunnel configuration is in place.\nS:U - The out-of-bounds read and its consequences are confined to the host kernel that contains the defective checksum call. The vulnerable and impacted components are the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - csum_partial() reads a fixed 1240 bytes from a linear buffer that may hold only tens of bytes, overreading up to roughly a kilobyte of adjacent kernel slab memory — far beyond a \"few bytes.\" Worse, the folded result is placed in the ICMPv6 checksum field and transmitted back to the attacker, yielding a repeatable oracle over kernel heap contents that heap grooming can turn into a real disclosure.\nI:N - The defect is a read-only overrun; no kernel memory is written, no bounds are exceeded on a store, and there is no type confusion or control-flow influence. The only consequence for state is an incorrect checksum on an outgoing packet, which the receiver discards.\nA:H - Reading up to ~1KB past the end of a slab allocation can walk off the backing pages into unmapped memory, faulting in softirq context and oopsing the kernel. On KASAN or panic_on_oops/hardened kernels the access panics the machine outright, and the attacker can repeat it at will with a stream of oversized packets." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/ip_tunnel_core.c" ], "versions": [ { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d", "status": "affected", "versionType": "git" }, { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "d964dd1bc1452594b4207d9229c157d9386e5d8a", "status": "affected", "versionType": "git" }, { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e37cde7a5716466ff2a76f7f27f0a29b05b9a732", "status": "affected", "versionType": "git" }, { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "510c869ffa4068c5f19ff4df51d1e2f3a30aaac1", "status": "affected", "versionType": "git" }, { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "7dc9feb8b1705cf00de20563b6bc4831f4c99dab", "status": "affected", "versionType": "git" }, { "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "d75abeec401f8c86b470e7028a13fcdc87e5dd06", "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/ipv4/ip_tunnel_core.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.210", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.149", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.78", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.17", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.5", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.9", "versionEndExcluding": "5.10.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.149" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.7.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d" }, { "url": "https://git.kernel.org/stable/c/d964dd1bc1452594b4207d9229c157d9386e5d8a" }, { "url": "https://git.kernel.org/stable/c/e37cde7a5716466ff2a76f7f27f0a29b05b9a732" }, { "url": "https://git.kernel.org/stable/c/510c869ffa4068c5f19ff4df51d1e2f3a30aaac1" }, { "url": "https://git.kernel.org/stable/c/7dc9feb8b1705cf00de20563b6bc4831f4c99dab" }, { "url": "https://git.kernel.org/stable/c/d75abeec401f8c86b470e7028a13fcdc87e5dd06" } ], "title": "tunnels: fix out of bounds access when building IPv6 PMTU error", "x_generator": { "engine": "bippy-1.2.0" } }, 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