ipv6: do not let ipv6_find_hdr() return an offset past the packet end

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98532
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:04 UTC
Updated2026-10-18 16:17:04 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b ca96b38730e31357ef4a9d76af1336958ac670d7 git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b 531255de8971c06d5d5986f85fdc2525d707ba71 git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b 543354c6efb27eae3372a3a9674aeaa2a86e2b2c git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b dc92cb972e86790b8078337ec41015b748b8f8e5 git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b 1c70275ca87e769e1a52abc644d61372d8c016cb git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b 1d42828565889632068fbc2983c34d57c66af4e0 git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b 4254d5878c320c19961dd0b8e1d0aca4800d8b7d git Not specified
CNA Linux Linux affected f8f626754ebeca613cf1af2e6f890cfde0e74d5b ee319bd3a0e976af5087cbe59ebc50a66f31d202 git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ca96b38730e31357ef4a9d76af1336958ac670d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d42828565889632068fbc2983c34d57c66af4e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/543354c6efb27eae3372a3a9674aeaa2a86e2b2c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc92cb972e86790b8078337ec41015b748b8f8e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/531255de8971c06d5d5986f85fdc2525d707ba71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee319bd3a0e976af5087cbe59ebc50a66f31d202 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c70275ca87e769e1a52abc644d61372d8c016cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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