# CVE-2026-97614: linux: In the Linux kernel, the following vulnerability has been resolved:  net: dsa: tag_brcm: legacy FCS: request needed t...

CVE-2026-97614 is fixed in linux on 1 platform by DEBIAN-CVE-2026-97614 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-97614
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 25, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: dsa: tag_brcm: legacy FCS: request needed tailroom  The legacy FCS tagger calculates the CRC over skb->len bytes starting at skb->data. When a nonlinear skb reaches the tagger, this reads past the linear head into unrelated slab memory.  The tagger appends an Ethernet FCS but does not declare that tailroom. As a result, DSA leaves NETIF_F_SG and NETIF_F_FRAGLIST enabled on the user port, and nonlinear skbs can reach the CRC calculation.  Declare the required tailroom. DSA will then clear those features and the networking core will linearize skbs before the tagger runs.  A KASAN-enabled dsa_loop test using this tagger reports:    BUG: KASAN: slab-out-of-bounds in crc32_le   Read of size 1 at addr ffff8880397086c0 by task exp/135    Call Trace:    crc32_le (lib/crc/crc32-main.c:38)    brcm_leg_fcs_tag_xmit (net/dsa/tag_brcm.c:343)    dsa_user_xmit (net/dsa/user.c:942)    dev_hard_start_xmit (net/core/dev.c:3937)    __dev_queue_xmit (net/core/dev.c:4926)    packet_sendmsg (net/packet/af_packet.c:3110)    __sys_sendto (net/socket.c:2281)    The buggy address belongs to the object at ffff888039708400    which belongs to the cache skbuff_small_head of size 704   The buggy address is located 0 bytes to the right of    allocated 704-byte region [ffff888039708400, ffff8880397086c0)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.7-1 | [DEBIAN-CVE-2026-97614](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97614.md) | Oct 2, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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