RHSA-2026:5732
Vulnerability from csaf_redhat - Published: 2026-03-25 05:33 - Updated: 2026-03-25 19:11Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Moderate
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: bpf: Don't use tnum_range on array range checking for poke descriptors (CVE-2022-49985)
* kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240)
* kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
In the Linux kernel, the following vulnerability has been resolved: bpf: Don't use tnum_range on array range checking for poke descriptors Hsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which is based on a customized syzkaller: BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0 Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489 CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x9c/0xc9 print_address_description.constprop.0+0x1f/0x1f0 ? bpf_int_jit_compile+0x1257/0x13f0 kasan_report.cold+0xeb/0x197 ? kvmalloc_node+0x170/0x200 ? bpf_int_jit_compile+0x1257/0x13f0 bpf_int_jit_compile+0x1257/0x13f0 ? arch_prepare_bpf_dispatcher+0xd0/0xd0 ? rcu_read_lock_sched_held+0x43/0x70 bpf_prog_select_runtime+0x3e8/0x640 ? bpf_obj_name_cpy+0x149/0x1b0 bpf_prog_load+0x102f/0x2220 ? __bpf_prog_put.constprop.0+0x220/0x220 ? find_held_lock+0x2c/0x110 ? __might_fault+0xd6/0x180 ? lock_downgrade+0x6e0/0x6e0 ? lock_is_held_type+0xa6/0x120 ? __might_fault+0x147/0x180 __sys_bpf+0x137b/0x6070 ? bpf_perf_link_attach+0x530/0x530 ? new_sync_read+0x600/0x600 ? __fget_files+0x255/0x450 ? lock_downgrade+0x6e0/0x6e0 ? fput+0x30/0x1a0 ? ksys_write+0x1a8/0x260 __x64_sys_bpf+0x7a/0xc0 ? syscall_enter_from_user_mode+0x21/0x70 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f917c4e2c2d The problem here is that a range of tnum_range(0, map->max_entries - 1) has limited ability to represent the concrete tight range with the tnum as the set of resulting states from value + mask can result in a superset of the actual intended range, and as such a tnum_in(range, reg->var_off) check may yield true when it shouldn't, for example tnum_range(0, 2) would result in 00XX -> v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here represented by a less precise superset of {0, 1, 2, 3}. As the register is known const scalar, really just use the concrete reg->var_off.value for the upper index check.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:5732
In the Linux kernel, the following vulnerability has been resolved: sctp: avoid NULL dereference when chunk data buffer is missing chunk->skb pointer is dereferenced in the if-block where it's supposed to be NULL only. chunk->skb can only be NULL if chunk->head_skb is not. Check for frag_list instead and do it just before replacing chunk->skb. We're sure that otherwise chunk->skb is non-NULL because of outer if() condition.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:5732
Workaround
To mitigate this issue, prevent module sctp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
In the Linux kernel, the following vulnerability has been resolved: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by a BUG_ON(nhead < 0) at net/core/skbuff.c:2232 in pskb_expand_head(). This bug is triggered as part of the calipso_skbuff_setattr() routine when skb_cow() is passed headroom > INT_MAX (i.e. (int)(skb_headroom(skb) + len_delta) < 0). The root cause of the bug is due to an implicit integer cast in __skb_cow(). The check (headroom > skb_headroom(skb)) is meant to ensure that delta = headroom - skb_headroom(skb) is never negative, otherwise we will trigger a BUG_ON in pskb_expand_head(). However, if headroom > INT_MAX and delta <= -NET_SKB_PAD, the check passes, delta becomes negative, and pskb_expand_head() is passed a negative value for nhead. Fix the trigger condition in calipso_skbuff_setattr(). Avoid passing "negative" headroom sizes to skb_cow() within calipso_skbuff_setattr() by only using skb_cow() to grow headroom. PoC: Using `netlabelctl` tool: netlabelctl map del default netlabelctl calipso add pass doi:7 netlabelctl map add default address:0::1/128 protocol:calipso,7 Then run the following PoC: int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); // setup msghdr int cmsg_size = 2; int cmsg_len = 0x60; struct msghdr msg; struct sockaddr_in6 dest_addr; struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1, sizeof(struct cmsghdr) + cmsg_len); msg.msg_name = &dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = NULL; msg.msg_iovlen = 0; msg.msg_control = cmsg; msg.msg_controllen = cmsg_len; msg.msg_flags = 0; // setup sockaddr dest_addr.sin6_family = AF_INET6; dest_addr.sin6_port = htons(31337); dest_addr.sin6_flowinfo = htonl(31337); dest_addr.sin6_addr = in6addr_loopback; dest_addr.sin6_scope_id = 31337; // setup cmsghdr cmsg->cmsg_len = cmsg_len; cmsg->cmsg_level = IPPROTO_IPV6; cmsg->cmsg_type = IPV6_HOPOPTS; char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr); hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80 sendmsg(fd, &msg, 0);
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:5732
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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{
"cve": "CVE-2022-49985",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2025-06-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2373540"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don\u0027t use tnum_range on array range checking for poke descriptors\n\nHsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which\nis based on a customized syzkaller:\n\n BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0\n Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489\n CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n 1.13.0-1ubuntu1.1 04/01/2014\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x9c/0xc9\n print_address_description.constprop.0+0x1f/0x1f0\n ? bpf_int_jit_compile+0x1257/0x13f0\n kasan_report.cold+0xeb/0x197\n ? kvmalloc_node+0x170/0x200\n ? bpf_int_jit_compile+0x1257/0x13f0\n bpf_int_jit_compile+0x1257/0x13f0\n ? arch_prepare_bpf_dispatcher+0xd0/0xd0\n ? rcu_read_lock_sched_held+0x43/0x70\n bpf_prog_select_runtime+0x3e8/0x640\n ? bpf_obj_name_cpy+0x149/0x1b0\n bpf_prog_load+0x102f/0x2220\n ? __bpf_prog_put.constprop.0+0x220/0x220\n ? find_held_lock+0x2c/0x110\n ? __might_fault+0xd6/0x180\n ? lock_downgrade+0x6e0/0x6e0\n ? lock_is_held_type+0xa6/0x120\n ? __might_fault+0x147/0x180\n __sys_bpf+0x137b/0x6070\n ? bpf_perf_link_attach+0x530/0x530\n ? new_sync_read+0x600/0x600\n ? __fget_files+0x255/0x450\n ? lock_downgrade+0x6e0/0x6e0\n ? fput+0x30/0x1a0\n ? ksys_write+0x1a8/0x260\n __x64_sys_bpf+0x7a/0xc0\n ? syscall_enter_from_user_mode+0x21/0x70\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n RIP: 0033:0x7f917c4e2c2d\n\nThe problem here is that a range of tnum_range(0, map-\u003emax_entries - 1) has\nlimited ability to represent the concrete tight range with the tnum as the\nset of resulting states from value + mask can result in a superset of the\nactual intended range, and as such a tnum_in(range, reg-\u003evar_off) check may\nyield true when it shouldn\u0027t, for example tnum_range(0, 2) would result in\n00XX -\u003e v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here\nrepresented by a less precise superset of {0, 1, 2, 3}. As the register is\nknown const scalar, really just use the concrete reg-\u003evar_off.value for the\nupper index check.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: bpf: Don\u0027t use tnum_range on array range checking for poke descriptors",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "self",
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},
{
"category": "external",
"summary": "RHBZ#2373540",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373540"
},
{
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"summary": "https://www.cve.org/CVERecord?id=CVE-2022-49985",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-49985"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-49985",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49985"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025061822-CVE-2022-49985-3e41@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025061822-CVE-2022-49985-3e41@gregkh/T"
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},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40240"
},
{
"category": "external",
"summary": "RHBZ#2418832",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418832"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40240",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40240"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40240",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40240"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120403-CVE-2025-40240-745a@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120403-CVE-2025-40240-745a@gregkh/T"
}
],
"release_date": "2025-12-04T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-03-25T05:33:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "kernel: sctp: avoid NULL dereference when chunk data buffer is missing"
},
{
"cve": "CVE-2025-71085",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"discovery_date": "2026-01-13T00:00:00+00:00",
"ids": [
{
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],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\n\nThere exists a kernel oops caused by a BUG_ON(nhead \u003c 0) at\nnet/core/skbuff.c:2232 in pskb_expand_head().\nThis bug is triggered as part of the calipso_skbuff_setattr()\nroutine when skb_cow() is passed headroom \u003e INT_MAX\n(i.e. (int)(skb_headroom(skb) + len_delta) \u003c 0).\n\nThe root cause of the bug is due to an implicit integer cast in\n__skb_cow(). The check (headroom \u003e skb_headroom(skb)) is meant to ensure\nthat delta = headroom - skb_headroom(skb) is never negative, otherwise\nwe will trigger a BUG_ON in pskb_expand_head(). However, if\nheadroom \u003e INT_MAX and delta \u003c= -NET_SKB_PAD, the check passes, delta\nbecomes negative, and pskb_expand_head() is passed a negative value for\nnhead.\n\nFix the trigger condition in calipso_skbuff_setattr(). Avoid passing\n\"negative\" headroom sizes to skb_cow() within calipso_skbuff_setattr()\nby only using skb_cow() to grow headroom.\n\nPoC:\n\tUsing `netlabelctl` tool:\n\n netlabelctl map del default\n netlabelctl calipso add pass doi:7\n netlabelctl map add default address:0::1/128 protocol:calipso,7\n\n Then run the following PoC:\n\n int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\n\n // setup msghdr\n int cmsg_size = 2;\n int cmsg_len = 0x60;\n struct msghdr msg;\n struct sockaddr_in6 dest_addr;\n struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\n sizeof(struct cmsghdr) + cmsg_len);\n msg.msg_name = \u0026dest_addr;\n msg.msg_namelen = sizeof(dest_addr);\n msg.msg_iov = NULL;\n msg.msg_iovlen = 0;\n msg.msg_control = cmsg;\n msg.msg_controllen = cmsg_len;\n msg.msg_flags = 0;\n\n // setup sockaddr\n dest_addr.sin6_family = AF_INET6;\n dest_addr.sin6_port = htons(31337);\n dest_addr.sin6_flowinfo = htonl(31337);\n dest_addr.sin6_addr = in6addr_loopback;\n dest_addr.sin6_scope_id = 31337;\n\n // setup cmsghdr\n cmsg-\u003ecmsg_len = cmsg_len;\n cmsg-\u003ecmsg_level = IPPROTO_IPV6;\n cmsg-\u003ecmsg_type = IPV6_HOPOPTS;\n char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\n hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\n\n sendmsg(fd, \u0026msg, 0);",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability allows an unprivileged user to trigger a kernel BUG by causing an integer overflow in the headroom calculation used by skb_cow(), which results in a negative size passed to pskb_expand_head(). The kernel subsequently hits a reachable BUG_ON() and crashes, leading to a reliable denial-of-service condition. In worst-case scenarios, this path may be reachable via crafted IPv6 traffic with CALIPSO options.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-71085"
},
{
"category": "external",
"summary": "RHBZ#2429026",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429026"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-71085",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-71085"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-71085",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71085"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026011340-CVE-2025-71085-e6c1@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026011340-CVE-2025-71085-e6c1@gregkh/T"
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{
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}
Loading…
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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