Answer in brief
CVE-2026-53227 records a Medium severity (CVSS 5.5) vulnerability in net: openvswitch: fix possible kfree_skb of ERR_PTR. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <e248fb2e680deb2bd37bac551b72638fe4938a76 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <971b1b37774f13acc5add0a2843f8598446b8598 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <25fdf53698535fe8790237f5a8a9626791429785 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <e3d509a1b71396e1452060dbf84a805fd1c3c549 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <ecc55aad3390129a87106841f4b68bf3d70c9264 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <895d1dd9057cde1687fa0f4286d47ceed0b82997 || >=893f139b9a6c00c097b9082a90f3041cfb3a0d20 <ee30dd2909d8b98619f4341c70ec8dc8e155ab02 | e248fb2e680deb2bd37bac551b72638fe4938a76, 0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d, 971b1b37774f13acc5add0a2843f8598446b8598, 25fdf53698535fe8790237f5a8a9626791429785, e3d509a1b71396e1452060dbf84a805fd1c3c549, ecc55aad3390129a87106841f4b68bf3d70c9264, 895d1dd9057cde1687fa0f4286d47ceed0b82997, ee30dd2909d8b98619f4341c70ec8dc8e155ab02 |
| Linux/Linuxgeneric | 3.16 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking. If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer. Fix this by setting the pointer to NULL after having saved its error value.
Quoted source text, attributed separately from HOL analysis.