net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit
In the Linux kernel, the following vulnerability has been resolved: net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit teql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit through slave devices, but does not update skb->dev to the slave device beforehand. When a gretap tunnel is a TEQL slave, the transmit path reaches iptunnel_xmit() which saves dev = skb->dev (still pointing to teql0 master) and later calls iptunnel_xmit_stats(dev, pkt_len). This function does: get_cpu_ptr(dev->tstats) Since teql_master_setup() does not set dev->pcpu_stat_type to NETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats for teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes NULL + __per_cpu_offset[cpu], resulting in a page fault. BUG: unable to handle page fault for address: ffff8880e6659018 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 68bc067 P4D 68bc067 PUD 0 Oops: Oops: 0002 [#1] SMP KASAN PTI RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89) Call Trace: ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847) __gre_xmit (net/ipv4/ip_gre.c:478) gre_tap_xmit (net/ipv4/ip_gre.c:779) teql_master_xmit (net/sched/sch_teql.c:319) dev_hard_start_xmit (net/core/dev.c:3887) sch_direct_xmit (net/sched/sch_generic.c:347) __dev_queue_xmit (net/core/dev.c:4802) neigh_direct_output (net/core/neighbour.c:1660) ip_finish_output2 (net/ipv4/ip_output.c:237) __ip_finish_output.
CVE-2026-23277
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23277
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "383493b9940e3d1b5517424081b3e072e20ec43c",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "6b1f563d670162e188a0f2aec39c24b67b106e17",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "57c153249143333bbf4ecf927bdf8aa2696ee397",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "59b06d8b9bdb6b64b3c534c18da68bce5ccd31be",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "81a43e8005366f16e629d8c95dfe05beaa8d36a7",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "0bad9c86edd22dec4df83c2b29872d66fd8a2ff4",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "21ea283c2750c8307aa35ee832b0951cc993c27d",
"versionType": "git"
},
{
"status": "affected",
"version": "039f50629b7f860f36644ed1f34b27da9aa62f43",
"lessThan": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_teql.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_teql.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23277
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27208 · Revision 1
- Added to Heist Feed
- Publisher date