xsk: fix NULL pointer dereference in __xsk_rcv()
In the Linux kernel, the following vulnerability has been resolved: xsk: fix NULL pointer dereference in __xsk_rcv() In the __xsk_rcv() multi-buffer path, xsk_buff_alloc() is called in a loop without checking its return value. xsk_buff_can_alloc() only counts fill queue entries without validating their addresses, so it can succeed while xsk_buff_alloc() rejects all remaining entries and returns NULL. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:__xsk_rcv+0x426/0xc20 (net/xdp/xsk.c:350) Call Trace: xsk_generic_rcv+0x26d/0x5f0 xdp_do_generic_redirect+0x3c5/0xcf0 do_xdp_generic+0x92f/0xe70 __netif_receive_skb_core.constprop.0+0xf7e/0x2b30 Fix this with a two-stage transaction. First allocate and stage all buffers required for the packet, recycling all staged buffers with xsk_buff_free() if any allocation fails. Only after this stage succeeds, copy the data, reserve the RX descriptors, and release the buffers in an error-free loop.
CVE-2026-90115
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-2026-90115
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": "804627751b4281dd95148e7564759145da67855e",
"lessThan": "aaebce297efc3e3dccb98a6ff838cfaa47db08db",
"versionType": "git"
},
{
"status": "affected",
"version": "804627751b4281dd95148e7564759145da67855e",
"lessThan": "60d7d3559ce66e227e195e9463cdfed8077c8659",
"versionType": "git"
},
{
"status": "affected",
"version": "804627751b4281dd95148e7564759145da67855e",
"lessThan": "214fb79b0379cb0214905632a2537c0c33f594eb",
"versionType": "git"
},
{
"status": "affected",
"version": "804627751b4281dd95148e7564759145da67855e",
"lessThan": "8341bd3ff126d85bc8c4ed52eedcaa5b1a65f194",
"versionType": "git"
},
{
"status": "affected",
"version": "804627751b4281dd95148e7564759145da67855e",
"lessThan": "e37b2abca80473e106176e41712a369fd2f72117",
"versionType": "git"
}
],
"programFiles": [
"net/xdp/xsk.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xdp/xsk.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90115
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36519 · Revision 1
- Added to Heist Feed
- Publisher date