bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc sock_map_alloc() only rejects max_entries == 0 and otherwise allows any u32 value. sock_map_free() then walks the sks[] array with a signed int iterator: int i; for (i = 0; i < stab->map.max_entries; i++) struct sock **psk = &stab->sks[i]; When a SOCKMAP is created with max_entries = 0xffffffff (UINT_MAX), the allocation of 32 GiB can succeed on large-memory hosts. During free the counter reaches 0x80000000, wraps to INT_MIN, is sign-extended by movslq and turned into a ~16 GiB negative offset from stab->sks, pointing far below the allocation. The faulting access is an xchg() write in sock_map_free(). Without KASAN, the same out-of-bounds write can fault on an unmapped vmalloc page or corrupt an unrelated allocation if that vmalloc address is populated. On a KASAN kernel with CONFIG_KASAN_VMALLOC=y, the shadow check for that address hits an unmapped shadow page and oopses first: BUG: unable to handle page fault for address: fffff521b59c5a00 RIP: 0010:kasan_check_range+0x107/0x190 Call Trace: sock_map_free+0x93/0x190 map_create+0x68d/0xb30 __sys_bpf+0x21e/0x2e70 Vmcore confirmed stab->map.max_entries == 0xffffffff, stab->sks == 0xffffc911ace2d000, and the faulting address sks + (s64)INT_MIN * 8 exactly at 0xffffc90dace2d000. The same buggy path is reached on the normal close()/bpf_map_free_deferred() path whenever such a map is destroyed. sock_map_al
CVE-2026-98588
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-2026-98588
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": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "f4a73f49e256bd835368504462be3b57b03febff",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "c56191af3a578b9cc265fa3bd5fc0752c59c1781",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "909f761868fda329dc69130ef9eb5b5795bcdf00",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "cc70972ddbf0e3398f2f32624d31db78594d50d8",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "cea597519b9ca6d691c98d92460ead8ece2a07af",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8",
"versionType": "git"
},
{
"status": "affected",
"version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1",
"lessThan": "814a81c842bd88f6bd8a4ce550d560df071a5d03",
"versionType": "git"
}
],
"programFiles": [
"net/core/sock_map.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/sock_map.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98588
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38608 · Revision 1
- Added to Heist Feed
- Publisher date