- 8.1HighCVSS base score
- 0.61%Exploitation in 30 daysEPSS · top 50% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 6 days later
· 6 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.61% · top 50% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < ca96b38730e31357ef4a9d76af1336958ac670d7
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < 531255de8971c06d5d5986f85fdc2525d707ba71
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < 543354c6efb27eae3372a3a9674aeaa2a86e2b2c
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < dc92cb972e86790b8078337ec41015b748b8f8e5
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < 1c70275ca87e769e1a52abc644d61372d8c016cb
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < 1d42828565889632068fbc2983c34d57c66af4e0
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < 4254d5878c320c19961dd0b8e1d0aca4800d8b7d
- affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b – < ee319bd3a0e976af5087cbe59ebc50a66f31d202
- affected 3.8
- unaffected < 3.8
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.55 – ≤ 6.18.*
- unaffected 7.2.9 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ca96b38730e31357ef4a9d76af1336958ac670d7 (opens in a new tab)
- https://git.kernel.org/stable/c/531255de8971c06d5d5986f85fdc2525d707ba71 (opens in a new tab)
- https://git.kernel.org/stable/c/543354c6efb27eae3372a3a9674aeaa2a86e2b2c (opens in a new tab)
- https://git.kernel.org/stable/c/dc92cb972e86790b8078337ec41015b748b8f8e5 (opens in a new tab)
- https://git.kernel.org/stable/c/1c70275ca87e769e1a52abc644d61372d8c016cb (opens in a new tab)
- https://git.kernel.org/stable/c/1d42828565889632068fbc2983c34d57c66af4e0 (opens in a new tab)
- https://git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d (opens in a new tab)
- https://git.kernel.org/stable/c/ee319bd3a0e976af5087cbe59ebc50a66f31d202 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103577 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98532)Record last updated .