bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check start and len are u32, so u64 last = start + len; evaluates start + len in 32-bit and wraps before storing it in last. The bounds check if (start >= offset + l || last > msg->sg.size) return -EINVAL; can then be passed with an out-of-range start/len, after which the pop loop runs off the end of the scatterlist and sk_msg_shift_left() calls put_page() on the empty msg->sg.end slot: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline] RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline] RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984 Call Trace: bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8 bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746 sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934 tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline] tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583 __sock_sendmsg+0x153/0x1c0 net/socket.c:802 __sys_sendto+0x326/0x430 net/socket.c:2265 __x64_sys_sendto+0xe3/0x100 net/socket.c:2268 do_syscall_64+0x14c/0x480 entry_SYSCALL_64_after_hwframe+0x77/0x7f Widen the addition with a (u64) cast so the bound is evaluated in 64-bit and a len near U32_MAX no longer wraps below msg->sg.size. While
CVE-2026-74256
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-2026-74256
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": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "9ef44ed6fb0c1db01cfcc3de432a33e719713eb5",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "ba5cc05dae8fce237d191c7ea96b1107a791e548",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "c05a0ec1cdced622a1a0c7d85679fe02f31033ec",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "17eb9832a10db2f7a80cb429ca2bc5038445a943",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "fe09dd288722f1c749b7506c0b3e7841a7d85027",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "e09f7bd7273928b4089e6b71f8e992f2b356ca1b",
"versionType": "git"
},
{
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"lessThan": "a48802fb2cd2d1e23651989f8ff4d15e9d5dad54",
"versionType": "git"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74256
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33070 · Revision 1
- Added to Heist Feed
- Publisher date