Out-of-bounds Read Affecting kernel-rt-debug-kvm package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-KERNELRTDEBUGKVM-21260464
- published20 Oct 2026
- disclosed18 Oct 2026
Introduced: 18 Oct 2026
NewCVE-2026-98531 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel-rt-debug-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: enforce exact attribute length for SEG6_ATTR_DST
In seg6_genl_policy, SEG6_ATTR_DST is defined with .type = NLA_BINARY and .len = sizeof(struct in6_addr). For NLA_BINARY, .len only enforces the maximum payload length and permits shorter payloads (e.g., 0 bytes). When seg6_genl_set_tunsrc() copies sizeof(struct in6_addr) bytes via kmemdup(val, sizeof(*val), GFP_KERNEL), a short SEG6_ATTR_DST attribute triggers a 16-byte out-of-bounds read past skb->tail into uninitialized skb->head memory, which is stored in sdata->tun_src and leaked back to userspace via SEG6_CMD_GET_TUNSRC.
Switch SEG6_ATTR_DST in seg6_genl_policy to NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)) so that generic netlink validation rejects any attribute whose length is not exactly sizeof(struct in6_addr) with -ERANGE.
Tested in QEMU against Linux 7.3.0-rc3 by sending a SEG6_CMD_SET_TUNSRC Generic Netlink message with a 0-byte SEG6_ATTR_DST attribute followed by SEG6_CMD_GET_TUNSRC. On the unfixed kernel, SEG6_CMD_SET_TUNSRC succeeds (err = 0) and SEG6_CMD_GET_TUNSRC leaks 16 bytes of uninitialized kernel heap memory (tun_src = 836a61ecc4d25a1042a8d60411cfb378); with this patch applied, SEG6_CMD_SET_TUNSRC is rejected by netlink policy validation with -ERANGE (-34) and tun_src remains zeroed.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2554947
- https://access.redhat.com/security/cve/CVE-2026-98531
- https://git.kernel.org/stable/c/050a0aa3c80907b8c60a396b7e04d48d8b1a9e70
- https://git.kernel.org/stable/c/195813bb7324c338eaba0aaa02b18681ee65b670
- https://git.kernel.org/stable/c/209eefebee54c4a5f01d68b61e8ac9881eca2de9
- https://git.kernel.org/stable/c/2d959c75c27f90e9ec489d18ce5ee6b852ad4741
- https://git.kernel.org/stable/c/66bf65fa109326e4c4ddeb0b94093379f72838fd
- https://git.kernel.org/stable/c/6fcfc362344edea745a69f3a705de50b731f3418
- https://git.kernel.org/stable/c/94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e
- https://git.kernel.org/stable/c/e3ac68c1cdc2535d127b2bfd50c263d16c8e4199