Answer in brief
CVE-2026-98532 records a High severity (CVSS 8.1) vulnerability in ipv6: do not let ipv6_find_hdr() return an offset past the packet end. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (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 8.1. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <ca96b38730e31357ef4a9d76af1336958ac670d7 || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <531255de8971c06d5d5986f85fdc2525d707ba71 || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <543354c6efb27eae3372a3a9674aeaa2a86e2b2c || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <dc92cb972e86790b8078337ec41015b748b8f8e5 || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <1c70275ca87e769e1a52abc644d61372d8c016cb || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <1d42828565889632068fbc2983c34d57c66af4e0 || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <4254d5878c320c19961dd0b8e1d0aca4800d8b7d || >=f8f626754ebeca613cf1af2e6f890cfde0e74d5b <ee319bd3a0e976af5087cbe59ebc50a66f31d202 | ca96b38730e31357ef4a9d76af1336958ac670d7, 531255de8971c06d5d5986f85fdc2525d707ba71, 543354c6efb27eae3372a3a9674aeaa2a86e2b2c, dc92cb972e86790b8078337ec41015b748b8f8e5, 1c70275ca87e769e1a52abc644d61372d8c016cb, 1d42828565889632068fbc2983c34d57c66af4e0, 4254d5878c320c19961dd0b8e1d0aca4800d8b7d, ee319bd3a0e976af5087cbe59ebc50a66f31d202 |
| Linux/Linuxgeneric | 3.8 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: do not let ipv6_find_hdr() return an offset past the packet end ipv6_find_hdr() walks the extension header chain, skipping each header by the length that header itself declares. ipv6_optlen() returns up to 2048, and the skip is never checked against skb->len, so the offset stored in *offset can point past the end of the packet. openvswitch installs that offset as the transport header, and update_ipv6_checksum() then reads and writes the transport checksum field out of bounds: BUG: KASAN: slab-use-after-free in inet_proto_csum_replace16+0x445/0x470 Read of size 2 at addr ffff88810b754b06 by task ovs_ipv6_oob/629 CPU: 4 UID: 1000 PID: 629 Comm: ovs_ipv6_oob Tainted: G N 7.3.0-rc3+ #348 Call Trace: inet_proto_csum_replace16+0x445/0x470 set_ipv6_addr+0x3dd/0x460 do_execute_actions+0x6a3d/0x7c40 ovs_execute_actions+0xfd/0x480 ovs_packet_cmd_execute+0xc38/0xf20 genl_rcv_msg+0x59e/0x870 netlink_rcv_skb+0x18b/0x450 genl_rcv+0x2d/0x40 netlink_unicast+0x6bc/0xa20 The buggy address belongs to the object at ffff88810b754980 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 390 bytes inside of freed 704-byte region [ffff88810b754980, ffff88810b754c40) Other callers use that offset too, so bound it here rather than in one caller. Reject a header whose declared length does not fit in the packet. ipv6_find_hdr() already fails with -EBADMSG on a malformed chain, so this adds no new failure mode.
Quoted source text, attributed separately from HOL analysis.