xsk: fix NULL pointer dereference in __xsk_rcv()
Summary
| CVE | CVE-2026-90115 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-17 17:17:03 UTC |
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| Updated | 2026-09-17 17:17:03 UTC |
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| Description | 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 804627751b4281dd95148e7564759145da67855e aaebce297efc3e3dccb98a6ff838cfaa47db08db git |
Not specified |
| CNA |
Linux |
Linux |
affected 804627751b4281dd95148e7564759145da67855e 60d7d3559ce66e227e195e9463cdfed8077c8659 git |
Not specified |
| CNA |
Linux |
Linux |
affected 804627751b4281dd95148e7564759145da67855e 214fb79b0379cb0214905632a2537c0c33f594eb git |
Not specified |
| CNA |
Linux |
Linux |
affected 804627751b4281dd95148e7564759145da67855e 8341bd3ff126d85bc8c4ed52eedcaa5b1a65f194 git |
Not specified |
| CNA |
Linux |
Linux |
affected 804627751b4281dd95148e7564759145da67855e e37b2abca80473e106176e41712a369fd2f72117 git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.157 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.110 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.52 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.6 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/e37b2abca80473e106176e41712a369fd2f72117 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/aaebce297efc3e3dccb98a6ff838cfaa47db08db |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/60d7d3559ce66e227e195e9463cdfed8077c8659 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/214fb79b0379cb0214905632a2537c0c33f594eb |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/8341bd3ff126d85bc8c4ed52eedcaa5b1a65f194 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.