{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-23277", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23277", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-03-20T08:08:57.394Z", "updatedAt": "2026-10-15T01:13:33.847Z", "importedAt": "2026-10-24T01:58:02.025Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit\n\nteql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit\nthrough slave devices, but does not update skb->dev to the slave device\nbeforehand.\n\nWhen a gretap tunnel is a TEQL slave, the transmit path reaches\niptunnel_xmit() which saves dev = skb->dev (still pointing to teql0\nmaster) and later calls iptunnel_xmit_stats(dev, pkt_len). This\nfunction does:\n\n get_cpu_ptr(dev->tstats)\n\nSince teql_master_setup() does not set dev->pcpu_stat_type to\nNETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats\nfor teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes\nNULL + __per_cpu_offset[cpu], resulting in a page fault.\n\n BUG: unable to handle page fault for address: ffff8880e6659018\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 68bc067 P4D 68bc067 PUD 0\n Oops: Oops: 0002 [#1] SMP KASAN PTI\n RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89)\n Call Trace:\n \n ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847)\n __gre_xmit (net/ipv4/ip_gre.c:478)\n gre_tap_xmit (net/ipv4/ip_gre.c:779)\n teql_master_xmit (net/sched/sch_teql.c:319)\n dev_hard_start_xmit (net/core/dev.c:3887)\n sch_direct_xmit (net/sched/sch_generic.c:347)\n __dev_queue_xmit (net/core/dev.c:4802)\n neigh_direct_output (net/core/neighbour.c:1660)\n ip_finish_output2 (net/ipv4/ip_output.c:237)\n __ip_finish_output.part.0 (net/ipv4/ip_output.c:315)\n ip_mc_output (net/ipv4/ip_output.c:369)\n ip_send_skb (net/ipv4/ip_output.c:1508)\n udp_send_skb (net/ipv4/udp.c:1195)\n udp_sendmsg (net/ipv4/udp.c:1485)\n inet_sendmsg (net/ipv4/af_inet.c:859)\n __sys_sendto (net/socket.c:2206)\n\nFix this by setting skb->dev = slave before calling\nnetdev_start_xmit(), so that tunnel xmit functions see the correct\nslave device with properly allocated tstats.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "383493b9940e3d1b5517424081b3e072e20ec43c" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "6b1f563d670162e188a0f2aec39c24b67b106e17" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "57c153249143333bbf4ecf927bdf8aa2696ee397" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "59b06d8b9bdb6b64b3c534c18da68bce5ccd31be" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "81a43e8005366f16e629d8c95dfe05beaa8d36a7" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "0bad9c86edd22dec4df83c2b29872d66fd8a2ff4" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "21ea283c2750c8307aa35ee832b0951cc993c27d" }, { "version": "039f50629b7f860f36644ed1f34b27da9aa62f43", "status": "affected", "versionType": "git", "lessThan": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.5", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.5" }, { "version": "5.10.253", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.203", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.167", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.130", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.78", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.19", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }